Lake Victoria in East Africa is home to many species of fish called cichlids. In 1954 the predatory Nile perch was introduced to Lake Victoria. The Nile perch became the dominant fish species in the lake by the mid-1980s. The number of cichlid species in the lake decreased as the Nile perch population increased. The perch preyed heavily on cichlid species that fed on algae and debris on the bottom of the lake. Algae in the lake increased, and oxygen levels decreased. The surface area of the gills of some cichlid species has increased in over 20 years.
A. Increased gill surface area has allowed the cichlids to change their diet and avoid competing with the Nile perch.
B. Increased gill surface area has allowed the cichlids to be camouflaged and avoid being eaten by the Nile perch.
C. Increased gill surface area has allowed the cichlids to leave Lake Victoria and establish populations in nearby bodies of water.
D. Increased gill surface area has allowed the cichlids to better absorb the limited oxygen in the water.
Answer:
D. Increased gill surface area has allowed the cichlids to better absorb the limited oxygen in the water.
Explanation:
As the Nile perch fed on cichlid species that feed on algae, algae growth increased in the lake. The algae absorbed more oxygen, leaving less for the fish. Those with larger gills were able to absorb oxygen more efficiently, and were able to survive.
Counterclockwise rotation of the flagellum causes a bacterial cell to swim or ______ towards a stimulus, interrupted by clockwise rotation in which the cell ______ and changes its course.
Counterclockwise rotation of the flagellum causes a bacterial cell to swim or run towards a stimulus, interrupted by clockwise rotation in which the cell tumbles and changes its course.
How does a bacterium respond to stimuli?A bacterium is a unicellular organism that posseses a structure called flagellum.
Flagellum in bacteria is a long, whiplike proteinaceous appendage, used for locomotion.
However, a counterclockwise rotation of the flagellum causes a bacterial cell to swim or run towards stimulus. This rotation is interrupted by a clockwise rotation of the flagellum that causes the bacterium to tumble.
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Whats a independent variable and dependent varivle
Answer: The independant variable is what you change on purpose in the expirament and the dependant is the outcome of the expirament
Explanation:
Answer:
The dependent variable is the one thing that stays the same throughout the experiment.
The Independent variable is the one thing that changes in the experiment.
Example: You are measuring how far a marble will roll off of a ramp. The marble and distance is the dependent variable. The height of the ramp is the independent variable because you change the height every test
Explanation:
The study of the interactions between drugs and their receptors and the series of events that result in a pharmacologic response is called
Answer:
Pharmacodynamics (PD) is the study of the biochemical and physiologic effects of drugs (especially pharmaceutical drugs
100 points hurry
Explain at least three pro’s and three cons of invasive species . Three reasons why it’s a good solution and three reasons why it’s not, or what challenges it faces.
Who are the stakeholders (people who would care about this issue)? Include those who are supportive of the solution and how it would benefit the environment, and people who would be opposed to the solution (usually they would lose money somehow). If there are no people opposed, state that.
5. Which statement best describes the geocentric model of our solar system?
Answer:
Earth is at the center.
Explanation:
The geocentric model is a model system that explains how the planets in the solar system move around.
Ptolemy established the geocentric concept, which states that the earth is at the center of the solar system and that other celestial bodies, including planets and stars, rotate around it.
Nicolas Copernicus invalidated this model system by explaining that the sun is at the center of the solar system and that the planets rotate around it.
37. Describe the basic structure of the cell membrane. What is the cell membrane's main function?
Describe the biological community and an ecosystem to which you belong.
Answer:
All the populations living and interacting within a particular geographic area make up a biological (or biotic) community. The living organisms in a community together with their nonliving or abiotic environment make up an ecosystem .
There are lots of abiotic and biotic factors in our biological community that made up our ecosystem.
What makes a biological community?All the populations living and interacting within a particular geographic area make up a biological (or biotic) community. The living organisms in a community together with their nonliving or abiotic environment make up an ecosystem .
In our community, we are interact with various another species, plants tree on which our life and dependent. Abiotic factor like land, air, water are some of the main abiotic factor which make up our ecosystem.
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A biologist has mixed the polysaccharide agarose with other components to create a gel.
Which choice best describes the next step in gel electrophoresis?
A.The mixture is poured into a special tray and allowed to cool and solidify.
B.An electric current is run through the gel.
C.The gel is placed in a box with positive and negative electrodes.
D.DNA samples are loaded into wells.
Answer:
a
Explanation:
n.a
62 chromosomes
will be in the skin cells. How many chromosomes
of her offspring?
(3) 31
(4) 30
(1) 124
(2) 62
3. What would be an example of deposition?
Answer:
frost
Explanation:
Frost is the deposition of water vapour from humid air or air containing water vapour on to a solid surface. Solid frost is formed when a surface, for example a leaf, is at a temperature lower than the freezing point of water and the surrounding air is humid.
In sub-freezing air, water vapour changes directly to ice without first becoming a liquid. This is how frost and hoar frost form on the ground or other surfaces. Another example is when frost forms on a leaf.
What additional procedure must be done to indicate glucose is present?
The glucose urine test estimates the amount of sugar (glucose) in a urine sample. The existence of glucose in the urine is called glycosuria or glucosuria. Glucose classes can also be calculated using a blood test or a cerebrospinal fluid test.
What is diffusion?Diffusion refers to the natural tendency of a system to homogenize the concentrations of chemical species within it.
It is an irreversible transport phenomenon that results in the migration of chemical species into a medium. Under the effect of the thermal agitation, a displacement of the constituents of the zones of high concentration towards those of low concentration is observed.
Thus, The glucose urine test estimates the amount of sugar (glucose) in a urine sample.
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1. How do you think your organs work together to digest food?
2. What other inventions do you think are based on the functions of the digestive system?
3. How might you be able to tell that enzymes are working in your body?
4. How do different types of food change the number of digestive enzymes present in your body?
Answer:
1. Food moves through your GI tract by a process called peristalsis. The large, hollow organs of your GI tract contain a layer of muscle that enables their walls to move. The movement pushes food and liquid through your GI tract and mixes the contents within each organ.
2.The SmartPill is an ingested, wireless device for measuring the health of the digestive system. As it passes through the digestive tract, the capsule transmits data to a receiver, which is later returned to the doctor and the information downloaded onto a laptop computer.
3. When its not working many of the uncomfortable reactions such as an upset stomach, allergy-like symptoms or irritability are actually signs that the enzymes are working. The body is cleaning itself out and the healing process is starting.
4.One of the main reasons for reduced output of digestive enzymes is poor exocrine pancreatic function. The causes of Exocrine Pancreatic Insufficiency (EPI) are very diverse ranging from: Problems with the endocrine part of the pancreas such as insulin dysregulation from diet high in refined carbohydrates and diabetes.
Explanation:
a group of dead organism gets covered by mud. over long periods, they become fossil fuels. which statement correctly describes how carbon moves in this scenario?
carbon moves from the atmosphere to the geosphere.
carbon moves from the atmosphere to the hydrosphere.
carbon moves from the biosphere to the geosphere.
carbon moves from the biosphere to the hydrosphere.
Carbon moves from the biosphere to the geosphere is the correct statement.
How carbon moves in this scenario?
Carbon moves from the biosphere to the geosphere because the dead organism has carbon in its body and when it is decomposed the carbon goes into the soil.
So we can conclude that carbon moves from the biosphere to the geosphere is the correct statement.
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what is the overall reaction ( equation ) for photosynthesis?
Answer:
6CO2 + 6H2O → C6H12O6 + 6O2
Explanation:
The process of photosynthesis is commonly written as: 6CO2 + 6H2O → C6H12O6 + 6O2. This means that the reactants, six carbon dioxide molecules and six water molecules, are converted by light energy captured by chlorophyll (implied by the arrow) into a sugar molecule and six oxygen molecules, the products. Credits to Britannica.com
the internal motion of particles of matter is called
A. mechanical energy
b. chemical energy
c. electromagnetic energy
d. heat energy
Answer:
the answer is D heat energy
WRITE ABOUT PACKAGING OF DNA DOUBLE HELIX IN EUKARYOTES AND PROKARYOTES
Explanation:
Packaging Of Dna Double Helix:Prokaryotes
↬ No well defined nucleus.
↬ DNA is held with some proteins in nucleoid region.
Eukaryotes
↬ Histones:
↬ Positively charged proteins. ↬ Rich in arginine and lysine. ↬ 5 types:- H₁ H₂A, H₂B, H₃ H₄.↬ Histone octamer:
↬ A pair of 4 histones.↬ Nucleosome:
↬ DNA (-ve charge) makes two complete turns around the histone octamer (+ve charge) to form a nucleosome.Answer:
in prokaryotes there is there is not proper neucloseomw
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can someone help fill in this table and the questions thanks so much
During tubular reabsorption, most of the water, glucose, and ions in the glomerular filtrate are reabsorbed into the blood whereas urea is not.
What is tubular reabsorption?Tubular reabsorption refers to.the process whereby minerals and water are reabsorped from the glomerular filtrate into the blood.
The renal artery carries mineral rich, oxygenated blood from the heart to the kidneys whereas the renal veins carry deoxygenated blood from the kidneys back to the heart.
Blood in the renal arteries contains red blood cells, white blood cells, large blood proteins, glucose, water, ions, and urea.
Filtrate in the kidney tubules contains water, glucose, ions, and urea.
Filtrate not reabsorbed is urea.
Urine contains urea, ions and water.
Blood in the renal veins contains red blood cells, white blood cells, large blood proteins, glucose, water, and ions.
Therefore, in the process of tubular reabsorption, most of the water, glucose, and ions in the glomerular filtrate are reabsorbed into the blood whereas urea is not.
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13. Which method for producing electricity has had the most negative impact on the
atmosphere?
A burning fossil fuels
B. controlling nuclear fission
C. harnessing wind with windmill farms
D. using hydroelectric dams to block rivers
Helpppp please
Answer:
The answer is A.
Explanation:
One of the downsides to electricity is the way it is generated. Usually, electricity was generated through Coal which as a fossil fuel was pivotal in releasing large amounts of carbon dioxide into the atmosphere.The method for producing electricity that has had the most negative impact on the atmosphere is A) burning fossil fuels.
What is the consequence of burning fossil fuels ?Burning fossil fuels, such as coal, oil, and natural gas, releases large amounts of carbon dioxide and other greenhouse gases into the atmosphere. These gases trap heat in the Earth's atmosphere, leading to global warming and climate change.
In addition, burning fossil fuels also releases other pollutants, such as sulfur dioxide and nitrogen oxides, which can contribute to acid rain and other environmental problems.
While all methods of producing electricity have some impact on the atmosphere, burning fossil fuels has had the most negative impact due to the sheer amount of greenhouse gases and other pollutants that are released during the process.
While there are efforts to reduce the negative impacts of burning fossil fuels, such as developing cleaner burning technologies and transitioning to renewable energy sources, the continued use of fossil fuels for electricity generation remains a significant challenge for addressing climate change and reducing air pollution.
In addition to greenhouse gas emissions, burning fossil fuels also produces other pollutants, such as sulfur dioxide and nitrogen oxides, which can contribute to acid rain and other environmental problems.
Therefore, extraction, transportation, and storage of fossil fuels can also have negative environmental impacts, such as oil spills, groundwater pollution, and habitat destruction.
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A fossil of a new primate species is discovered. scientists find evidence that members of this species traveled long distances without putting their hands down on the ground and used tools. which trait would the fossil most likely have? a foramen magnum at the back of the skull a curve in the lumbar region of the spine a femur angled outward an opposable big toe
The trait would the fossil most likely have is a curve in the lumber region of the spine.
What is the concept of fossil?Fossils are remains or traces of animals and plants preserved in rocks. Remains are parts of an animal (eg bones, teeth, scales) or plant (eg trunks) and traces are evidence of its existence or activities (eg footprints).
From the fossils it is possible to see the evolutions that the animals suffered in this case it was a curve in the lumber region of the spine.
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Answer:
b. a curve in the lumbar region of the spine
Explanation:
when does the embryo form?
A. At the end of the third trimester
B. A few days after fertilization
C. In the second trimester
D. At the end of the first trimester
1 Minute, 15
1
Ø
III
The circle and squares that are shaded in
mean that those individuals
?
are females
are carriers for the trait or disorder
are not affected with the trait or disorder
are affected with the trait or disorder
Polar bears are believed to have evolved from brown bears 600,000 years ago. Their white fur is an adaptation that allows them to better survive in their snowy environment. This is an example of which mode of natural selection? Explain why you chose this answer.
Answer:
Polar bears have thick, warm, white coats to use as a disguise to sneak up and attack and kill their prey. Overall polar bears have white coats to blend in with their suroundings
Explanation:
what is the main reason equatorial ocean water is warmer than polar ocean water?
O A. Gyres in the northern hemisphere flow clockwise.
O B. The sun heats Earth and its oceans unevenly.
O C. Deep sea vents pump steam into oceans unevenly.
O D. Upwellings spew warm water toward the equator.
Answer:
option B
Explanation:
i think the answer will be B as the sun rays directly hit the earth at the equator and equatorial regions.
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Choose all the answers that apply.
Stars:
1are classified by temperature and color
2are made mostly of hydrogen and helium
3orbit the sun
4are mostly found between Mars and Jupiter
5generate their own heat and light
Answer:
The 4th option is wrong . Stars are Mostly found between Mars and Jupiter.
A person usually experiences small variations in body temperature over a 24-hour period. These variations in temperature are an example of
The small variations in body temperature which a person experiences over a 24-hour period is an example of dynamic equilibrium.
What is dynamic equilibrium?Dynamic equilibrium can be defined as the small variations in the temperature of the body of a living organism over a 24-hour period, which is typically a day.
This ultimately implies that, dynamic equilibrium simply refers to the small variations in body temperature which a person experiences over a 24-hour period.
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What would have happened if Went had carried out the experiment described in the second half of the animation using a block of impermeable plastic instead of permeable gelatin?
In the presence of an impermeable plastic, the shoot will grow in a curved manner towards the source of sunlight.
How do plants grow?One of the important things that is required for the effective growth of plants is light. In the presence of light, plants tend to grow upright without bending.
However, in the presence of an impermeable plastic, the shoot will grow in a curved manner towards the source of sunlight.
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What/who are primary consumers in the food chain process?
Answer:
Explanation:
Ruminant animals. Cows, goats, zebras, and giraffes are examples of primary consumers and these herbivores feed on plant material like grass, branches, and roots.
Birds. Many birds are examples of primary consumers because they only eat seeds, cherries,
Why did the students leave the amylase and starch solutions in the water bath for five minutes in step 3
Answer:
Each enzyme functions at an optimum temperature. Below the optimum temperature, the enzyme's function slows, and will eventually become inactive. Above the optimal temperature, the enzyme's activity will slow. Too far above the optimum temperature and the enzyme becomes denatured (its shape changes) and it can no longer function. Amylase is the enzyme that breaks starch (amylose) down into maltose. The amylase and the starch were placed in the water bath to allow the reaction to occur at amylase's optimum temperature of 37 C.
Which is the complementary dna strand to the following: aattcgtaccg
Answer:
The sequence along one strand is the "complement" of the sequence along the other strand, so that when two strands are bonded each base is paired with its complementary partner. A-T-T-C-G-G-A-C-T-A, is paired with this complementary strand: This allows A and T to pair and C and G to pair. Each base hydrogen-bonds to its complementary base.
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