Five hundred cockroaches of one species were sprayed with a new insecticide. Twenty-four hours later nearly all the cockroaches were dead. A few, however, survived. This outcome illustrates which one of darwin’s key ideas about natural selection and variation?.

Answers

Answer 1

Answer:

This shows that over time, some insects can become "pesticide-resistant" meaning that pesticides don't affect them anymore. And this only happens every few generations. Therefore, each generation is being naturally selected and accumulating variations that make them resist the chemicals. This shows that each cockroach's genes are changing to give them variation from the rest of the population.

I hope this helps!


Related Questions

Which of these is inorganic? answers are A. Leaves
B. Earthworms
C. minerals
D. bacteria​

Answers

Answer:

C. minerals.

Explanation:

It would depend on what minerals you are talking about, but most minerals are inorganic. Organic substances contain carbon, in which leaves, earthworms, and bacteria all contain some sort of carbon.

Answer:

c. minerals

Explanation:

minerals are elements derived from

the Earth (derived from living matter)

Which valve prevents backflow into the right ventricle?.

Answers

tricuspid valves

These valves ensure that blood flows in only one direction, preventing backflow. The tricuspid valve is situated between the right atrium and right ventricle. The pulmonary valve is between the right ventricle and the pulmonary artery. The mitral valve is between the left atrium and left ventricle.

what does amplifier mean

Answers

Answer:

NOUN

an electronic device for increasing the amplitude of electrical signals, used chiefly in sound reproduction.

a device consisting of an amplifier combined with a loudspeaker, used to amplify electric guitars and other musical instruments.

Explanation:

Which fact about fossils is MOST important to scientists who study evolution?

Answers

Answer:

it b or d

Explanation:

that is the most important for scientistes to study

b tells what can be in the fossill or find in the fossill

so i think it b

Answer:

The correct answer is C

Explanation:

The reason why the age is of high importance is because it determines during what time the fossil lived and how it has evolved.

What is the question that you are trying to answer? What is your hypothesis for this experiment? What methods are you using to test this hypothesis? Outline the steps of the procedure in full sentences. Section II: Data & Analysis What graphs would clearly represent the trends in your data? Your Student Guide includes information on which graphs to construct. Each graph should have the following: an appropriate title appropriate labels for each axis an appropriate scale for each axis the correct units for the data Complete a rough sketch of each graph.

Answers

Explanation:

Give an experiment not a guide on how to write a lab report lol

Answer:

A line graph is often the most effective format for illustrating a relationship between two variables that are both changing. For example, time-series graphs can show patterns as time changes, like the unemployment rate over time.

Explanation:

Red-green colorblindness is a inherited disorder in which individuals have trouble distinguishes
between red and green (or brown and orange) and often confuse blue and purple hues. This
condition is usually found in males, as it is located on the X chromosome.
A man with red-green colorblindness has one brother who has normal version. From which parent did the man inherit colorblindness? Explain how you know using a Punnett square to © 2014 Vanessa Jason (“Biology Roots”
back up your answer.

Answers

Since the colorblindness is located on the X chromosome, the man must have inherited his colorblindness from his mother.

X-linked traits

Women are XX while men are XY.

Also, the X chromosome in XY always comes from the mother.

Since the man is affected for colorblindness but his brother is not, it means that only one X chromosome of the mother is affected while the father can be affected or otherwise.

Assuming the father is free from colorblindness and the allele is represented by c:

          [tex]X^cX[/tex]    x    [tex]XY[/tex]

      [tex]X^cX[/tex]    [tex]X^cY[/tex]    [tex]XX[/tex]    [tex]XY[/tex]

Thus, the man's genotype is  [tex]X^cY[/tex] and it comes from the mother.

More on X-linked traits can be found here: https://brainly.com/question/9830755

What causes the heart's lub dub sound?
A. capillaries moving blood between arteries and veins
B. arteries delivering oxygen rich blood to the rest of the
body
C. valves opening and closing while returning blood to
the heart
D. lungs oxygenating blood and exhaling carbon dioxide

Answers

Answer:

The answer of this question is the opening and closing of the heart valves of the heart valves. I believe that the answer is C, or "valves opening and closing while returning blood to the heart"

I have 5 mins left please help!!

#1 Which of these events happened earliest in the history of life on Earth?
A. eukaryotic cells with a nucleus
B. skeleton made of bone
C. multicellular organisms, like algae
D. opposable thumbs

#2 Which of these events happened earliest in the history of life on Earth?
A. dinosaurs
B. early animals
C. prokaryotic cells
D. eukaryotic cells

#3 Early life needed which of the following conditions to exist?
A. building block molecules
B. a source of energy
C. instructions
D. all of these were necessary

#4 It is thought that prokaryotes that were good at making ATP began to live inside other prokaryotes that were good at getting glucose. One provided glucose while the other shared its ATP. This formed early mitochondria, and natural selection favored these cells and they diversified to many forms. This idea is called the
A. cell theory
B. endosymbiont theory.
C. mitochondria theory.
D. eukaryotic theory.

Answers

Explanation:

4) option B endosymbiont theory

2) option C prokaryotic cells

Daughter cells produced when cells undergo mitosis are genetically _______, and daughter cells produced when cells undergo meiosis are genetically _______.

Answers

Answer:

Daughter cells produced when cells undergo mitosis are genetically identical, and daughter cells produced when cells undergo meiosis are genetically diverse.

Explanation:

Hope this helped <3 Brainliest please? :)

The cranial nerves that innervate the eye muscles are.

Answers

Cranial nerve 4 (Trochlear) - Superior oblique
Cranial nerve 5 (Abducens) - Lateral rectus
Cranial nerve 3 (Oculomotor) - All other extraocular muscles

I need help ahhhhhhhhhh

Answers

Answer:

C.B.A.D.The prophase is the first part of cell division, where the chromosomes become visible in the form of paired chromatids.The telophase is the final phase of cell division in which the chromosomes move to opposite ends, and nuclei are formed. Although this most relates to option D, option D relates more to the anaphase, which we will talk about in just a moment.The metaphase is the second phase, where the chromosomes all line up at the equator, and they attach to spindle fibers.The anaphase, which is the phase after metaphase, is extremely nessescary for cell division. This is the process in when the chromatids move toward opposite poles, allowing the spindle fibers to shorten. When this happens, the cell splits in two, forming the two daughter cells.

________________________________________________________

What have we learned?

We learned the four phases of mitosis, and what they do.

Questions related to the topic? Ask me in the comments box.


The sum of the genetic traits in this population
called its ✓ gene pool
COMPLETE
In guinea pigs, fur length is controlled by one
gene. The Fallele generates long fur and the f
allele generates short fur. Because only one F
copy is needed to show the trait, if a guinea pig
has the FF or Ff allele combination, they will have
long fur. If they have the ff allele combination, they
will have short fur
There is a total of 4 y alleles in this populatio
There are
Falleles in the population,
There are
falleles in the population
Look at the data for a guinea pig population to
answer the following questions,
DONE
Guinea pig 1: Long fur (FF)
Guinea pig 2 Short fur (ff)
Guinea pig 3. Long fur (FF)

Answers

The fur length of the guinea pig will depend on the alleles present in the offspring, whether they are dominant or recessive.

What are dominant and recessive traits?

Dominant traits are characters which are always expressed in an offspring wherever they occur.

Recessive traits on the other hand are expressed only if the dominant trait is absent in the offspring.

In the trait for fur length in guinea pig, there are two alleles for it.

F is for long fur and is dominant f is for short fur and is recessive.

Thus, the possible combination of the two alles will be:

FF for long furFf for long fur andff for short fur

Therefore, the fur length of the guinea pig depends on the alleles present in th offspring, either dominant or recessive.

Learn more about dominant and recessive traits at: https://brainly.com/question/848027

This text is from the transcript of the video "Adélie Penguins" from the NOAA web site Ocean Today.
Studies show that since 1950, the western Antarctic peninsula winter has warmed 11 °F, five times the global average. This warming trend is decreasing the amount of sea ice that forms and shrinking the habitat where young krill grow. This puts the Adélies’ food supply and their breeding success at risk. Complicating matters, Gentoo and Chinstrap penguins, which favor conditions with less sea ice, are taking over some of the Adélie colonies in this area.
Which statement is supported by both the text and the excerpt above?

A.
All three penguin species, Chinstrap, Adélie, and Gentoo, live only on sea ice.

B.
The food supply for Adélie penguins includes both fish and krill in the Antarctic seas.

C.
Adélie penguins are dependent on the existence of sea ice for access to their food supply.

D.
Temperatures in the Antarctic have increased substantially in the last 60 years.

Answers

Answer:

C.

Adélie penguins are dependent on the existence of sea ice for access to their food supply.

Explanation: Their numbers are declining due to the loss of sea ice, so it's natural that this would be the answer.

Why are common areas difficult to conserve

Answers

Answer:

The production and consumption of natural resources is necessary for society to function

Explanation:

please answer by tonight!!​

Answers

Answer:

C

Explanation:

How do species change over time to adjust to varying conditions?

Answers

The specimens with traits that fit the new environment get more offspring compared to other individuals. The offspring inherits the useful traits of its parent and in turn get more offspring. This eventually leads to the useful trait being found almost everywhere in the population.

Examine the words. impulse, presynaptic cell, neurotransmitters, receptors, postsynaptic cell what idea can be described using all the words listed? the difference between the somatic and autonomic nervous systems the transfer of information from one neuron to another the difference between the central and peripheral nervous systems the flow of information within a neuron

Answers

The idea it can describe is that it is the transfer of information from one neuron to another.

Transfer of information

The nervous system is part of the body systems that helps in the transfer of information from nerve to nerve and from nerve to muscle tissues.

The presynaptic nerve is the nerve that sends the information that is to be conveyed in form of action potential impulses.

The impulses led to the release of neurotransmitters from the terminal of the presynaptic nerve to the synapse. This binds to the receptor if the postsynaptic cell which receives the message.

Learn more about neurotransmitters here:

https://brainly.com/question/840056

Answer:

the transfer of information from one neuron to another

Explanation:

edge 2022

you're welcome!!!!!

Using the phylogenetic tree which is more related fungi and animals or plants and fungi. Explain why​

Answers

Answer:

The study of cladistics, however, results in a phylogeny tree in which fungi are more closely related to animals than to plants. In other words, animals have a more recent common ancestor with fungi than with plants, and the mushrooms in your salad are more closely related to you than to the lettuce. Differences Between Fungi and Animals

Explanation:

whoever answers this correctly gets brainliest

Answers

Answer:

its 2. Jim Bob

Explanation:

Fitness in this sense means how much an organism produces and how well that organism adapt to an environment

In recent decades, average global temperatures have increased significantly. Scientists agree that the widespread destruction of the Amazon rain forest contributes to climate change. Which mechanism might be cited to support that hypothesis?

A Deforestation causes water on the ground to reflect sunlight.

B Deforestation reduces the number of plants able to absorb carbon dioxide.

C Photosynthesis produces energy, which gives off heat.

D Plants use up energy during cellular respiration.

Answers

[tex]\qquad\qquad\huge\underline{{\sf Answer}}♨[/tex]

The main reason causing average global temperature rise is increase in amount of green house gases like Carbodioxide, and since deforestation reduces a vast number of plants, so there is lack of plants absorbing CO2 causing this whole thing.

So, according to this the Correct choice is B

The mechanism that supports the hypothesis that the widespread destruction of the Amazon rainforest contributes to climate change is  Deforestation reduces the number of plants able to absorb carbon dioxide. The correct option is B.

Forests, like the Amazon rainforest, play a crucial role in mitigating climate change because trees act as carbon sinks. They absorb carbon dioxide during photosynthesis and store it as biomass. When forests are cut down or destroyed through deforestation, the carbon stored in trees is released back into the atmosphere in the form of carbon dioxide, a greenhouse gas that contributes to global warming.

The Amazon rainforest, often referred to as the "lungs of the Earth," is particularly vital in this regard because of its vast size and high biodiversity. As large areas of the forest are cleared for logging, agriculture, and other human activities, the ability of the Amazon to absorb carbon dioxide diminishes, leading to increased greenhouse gas concentrations in the atmosphere and contributing to the warming of the planet.

To know more about Deforestation:

https://brainly.com/question/32556346
#SPJ3

Why are copper used in motors (proper para please )

Answers

Answer:

They do such a great job of conducting the electricity and power through the appliance they are used in.

Explanation:

Refer to the illustrations showing a sarcomere in two different stages What does Stage 2 represent?
a muscle that is rotating
a muscle that is fully at rest
a muscle that is fully contracted​

Answers

Answer:

Stage 2 represents a muscle that is fully contracted.

Explanation:

Verified by correct test results.

Answer:

a muscle that is fully contracted

Explanation:

Name 2 reasons why bacteria are resistant to antibiotics?

Answers

Answer:

Antibiotic resistance

Antibiotic resistance is accelerated when the presence of antibiotics pressure bacteria and fungi to adapt. Antibiotics and antifungals kill some germs that cause infections, but they also kill helpful germs that protect our body from infection. The antibiotic-resistant germs survive and multiply.

Which of the following best explains how a dog is able to ingest and digest food, and remove waste
products from its body?
Choose 1 answer:
A dog carries out digestion and excretion through a series of redundant systems, so if one
system is injured, another will take its place.
A dog has cells whose genetic makeup can change depending on the circumstances, such as
whether the animal is ingesting and digesting food, or excreting waste.
A dog has systems of specialized cells, such as those that make up the urinary tract and
digestive system, that help it carry out these functions.

Answers

Answer:

1st is correct

Explanation:

At its simplest, a dog's digestive system is a long tunnel that runs from their mouth to the anus. Food goes in at the mouth and travels through this tube and at various stages is broken down and either absorbed into the body or excreted as waste at the anus.

During mitosis, centromeres separate and chromatids become individual chromosomes during which phase?.

Answers

Answer:

Anaphase

Explanation:

During anaphase, the centromere splits, allowing the sister chromatids to separate.

hope this helps

pls mark brainliest

Which of the following is a negative consequence of nuclear power that concerns many environmentalists?

A
electrical shocks

B
carbon emissions

C
nuclear waste

D
smog

Answers

Nuclear waist I believe
Sorry if I’m wrong
I think the answer is C- nuclear waste

Which characteristic do these countries have in common? • North Korea • China • Cuba • Vietnam

Answers

Answer

They privatized industry to maximize profits.

Explanation:

I am sure

Body structure and colour of animal help them in adaptation. Justify this statement with an example.​

Answers

Answer:

Cuttlefish

Explanation:

They camouflage with their surroundings to attract their prey, but also hide from predators.

rue or false: Cells start dividing when they snugly contact neighboring cells or when growth factors are withdrawn

Answers

False because cells don’t start diving when they contact a neighboring cell.

In translation, what would be the correct trna anticodon for the codon acc?.

Answers

Answer:

below

Explanation:

codon. ACC

anticidon UGG

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