Answer:
a. The letters Na with one dot
Explanation:
An atom can be defined as the smallest unit comprising of matter that forms all chemical elements. Thus, atoms are basically the building blocks of matters and as such determines or defines the structure of a chemical element.
Generally, atoms are typically made up of three distinct particles and these are protons, neutrons and electrons.
In Chemistry, electrons can be defined as subatomic particles that are negatively charged and as such has a magnitude of -1.
Valency can be defined as a measure of the combining power of a chemical element with other atoms to form a molecule or chemical compound.
Valence electrons can be defined as the number of electrons present in the outermost shell of an atom. Thus, valence electrons are used to determine whether an atom or group of elements found in a periodic table can bond with others.
Sodium is a chemical element that is found in group (1) of the periodic table and as such it has 1 electrons in its outermost shell. Also, the chemical symbol for Sodium is Na and it has one (1) valence electron.
A Lewis structure can be defined as a structural representation of an atom or molecule by using a dot to show the position and distribution of electron(s) around the atom or molecule.
Hence, the letters Na with one (1) dot is a correct Lewis structure diagram for Sodium (Na) because it has just one (1) valence electron in outermost shell.
For example, the Lewis structure diagram for Sodium (Na) is •Na.
Answer:
Na with 1 dot
Explanation:
i took the test
Osmosis is a form of _________ that involves the movement of
Answer:
Osmosis is a form of passive transport that involves the movement of water or other solvents through a semi-permeable membrane into an area of higher solute concentration.
For example:
Plant root hairs absorb water from the ground. The roots have a higher solute concentration than soil which is why water flows into the roots.
HELP PLS!!!!!!!!!!!!
Beaches are monitored to protect public health. Waterborne pathogens can cause illnesses. Which of the following is not a common type of pathogen at the beach?
Bacteria
Protozoa
Viruses
Worms
ALL these microorganisms can represent common types of pathogens at the beach. In consequence, it is imperative to take precaution measures to avoid infections.
The sand at the beach may contain dog feces, which is known to transport Toxocara canis, a parasite roundworm able to infect humans.
Moreover, samples of beach sand may also contain different types of pathogenic bacteria (e.g., Staphylococcus species, E. coli, Enterobacteriacea, etc) and viruses (e.g., enteroviruses, hepatitis A, Norwalk viruses, reoviruses, rotaviruses, etc).
In consequence, it is imperative to wash hands with soap and water when touching beach sand that is suspected to be contaminated.
Finally, marine water may also be contaminated with different zoonotic protozoa such as, among others, Giardia, Cryptosporidium and Toxoplasma.
Learn more in:
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Answer:
The correct answer is worms.
Explanation:
Yes, all of these can be found at the beach, but worms are not common. Also, I took the test lol!
Decomposers make ______
available.
A. erosion
B. air
C. weathering
D. nutrients
Answer:
D
Explanation:
Answer:
D. Nutrients.
Explanation:
Yong is a massage therapist. Which field of science would Yong most likely need to know the most about in order to do his job? A. Life science B. Space science OC. Earth science O D. Physical science
Answer:
D) physical science
Explanation:
physical science is the only science that would benefit his work as a massage therapist
Answer:
D)
Explanation:
Yong would have to know physical science because your messaging the human body which is physically speaking is touch.
hope that help you
Study the diagram showing the range of temperature in the Earth’s layers.
Which temperature most likely corresponds to the asthenosphere?
1,613°C
2,521°C
3,628°C
6,217°C
Answer: a) 1,613°C
Explanation: just took the test
How long do scientists estimate that the sea has been at its current level?
250 years
2,500 years
25,000 years
250,000 years
Answer:
250,000
Explanation:
Answer:
A. 250 years
Explanation:
NASA measures sea level around the globe using satellites. The Jason-3 satellite uses radio waves and other instruments to measure the height of the ocean's surface – also known as sea level. It does this for the entire Earth every 10 days, studying how global sea level is changing over time.
21. Explain How did Earth's environments change
from the Neogene to the Quaternary Period?
Answer:
Climate change and the developments it spurs carry the narrative of the Quaternary, the most recent 2.6 million years of Earth's history. Glaciers advance from the Poles and then retreat carving and molding the land with each pulse. Sea levels fall and rise with each period of freezing and thawing.
Explanation:
What are three reasons the Fawnsfoot mussel is at risk??
Answer:
The human need for water is now the biggest danger to mussels. Habitat destruction, fragmentation from dams, and more recently an intense drought in the southern plains have all contributed to destruction of mussel beds.
Explanation:
Hormones exert an effect only on a gland or organ that has a ________ where that specific hormone can bind.
Hormones excite, inhibit, or regulate the activity of other organs when they exert their effect on a target cell where that specific hormone can bind.
A hormone is the substance secreted by certain glands that promotes, blocks or regulates the activity of the organs.
Target cells are cells that possess specific receptors for hormones on their surface.The recognition of a hormone by its target cell lies in the presence at the cellular level of glycoproteins, called receptors, which bind specifically to the hormone, with high affinity and in a reversible way.Receptors present some differences related to the type of hormone or neurotransmitter to which they bind, with their location in the cell and with the way of transferring information after their union with these molecules.Therefore, we can conclude that hormones are produced by certain glands, circulate through the blood and reach other cells called target cells, exerting a regulatory effect on them.
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Which of these will be the best for a jungle environment
I think answer choice B, I believe its a black panther
What safety precautions must I take in a minerals investigation?
what are Negative health effects of frequent, self-induced vomiting?
Answer: It can rot your teeth out because of the stomach acid.
Explanation:
Multiple choice please help!
Answer:
A=T is the answer ..............
Answer:
The correct answer is A) A=T
Explanation:
In the case of blood types, both alleles A and B may be expressed as the phenotype. This exemplifies:
Answer:
Codominance
Explanation:
Codominance is a relationship between two versions of a gene. Individuals receive one version of a gene, called an allele, from each parent. If the alleles are different, the dominant allele usually will be expressed, while the effect of the other allele, called recessive, is masked.
Why is frog development susceptible to minor environmental changes?
plz help
The correct answer is option B) They go through many developmental changes.
Frogs are amphibians, which means they can live on land and in water. Frogs have permeable skin and lay shellless eggs in water, where their larvae will metamorphose before emerging and entering their terrestrial environment. As a result, they are very sensitive to biological changes and pollutants since, during the maturation phase of a frog, numerous complicated cellular differentiation cycles occur. These cycles are interconnected and are set off by particular signals and reactions. Therefore, disruption in certain environmental factors can affect various developmental changes.
That is why the development of the frog is susceptible to minor environmental changes
Read more about Development of Frog:
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Why is frog development susceptible to minor environmental changes?
A. They live a significant portion of their life in water
B. They go through many developmental changes.
C. They are not adapted to live in aquatic environments.
D. Both A and B
Which macronutrient promotes root growth?
Answer: Phosphorus (P)
Explanation: Phosphorus is one of the important macronutrients of plants which promotes the plant root growth.
Phosphorus in good amount would lead to -
• Extensive roots
• Fewer shoots
• Stunted growth
Whereas if the plant deficits Phosphorus then it would lead to
• Poor root growth
• Few flowers or aborted flowers
• No fruits
what is the single greatest threat to biodiversity?
Answer:
Habitat loss
Explanation:
in fact it is the second largest threat to our existence on this planet next to Climate Change.
What names are used for the top process (requiring oxygen) and the bottom process (taking place without oxygen)?
Oxygen present → Krebs Cycle → Electron transport chain
→
Glycolysis
→ Lactic acid fermentation
Oxygen not present →
Alcohol fermentation
What names are used for the top process (requiring oxygen) and the bottom process (taking place without oxygen)?
How many ATP are produced by each process shown?
Answer:
Processes that takes place with oxygen is aerobic and processes that takes without oxygen is anaerobic.
Glycolysis and Krebs Cycle produces 2 Atp and ETC produces 34 Atp
it is 21,00 kilometers around the earth and the earth rotates in 24 hours how fast is it rotating
Answer: 21,000x24= 504,000 kilometers per hour.
Explanation: Hope that helped you.
Which statement is true about DNA base pairing rules?
A- cytosine can pair with guanine only
B- adenine can pair with cytosine only
C- Adenine can pair with thymine or cytosine
D- cytosine can pair with Adenine or guanine
Sheena's B lymphocytes (B cells) produced antibodies to protect her about 3-5 days after she was exposed to a virus. What type of immunity do antibodies provide
There are two types of immunity: These are acquired immunity and innate immunity.
The type of immunity that these antibodies provide is the acquired immunity.
When an individual's immune system responds to a foreign substance or pathogen, or when a person acquires antibodies from another source, this sort of immunity called the acquired immunity develops. It is a type of immunity developed over time in response to invasion of pathogens.Learn more about acquired immunity: https://brainly.com/question/21480961
what is pathogen????
Pathogen is kinda disease, virus, bacteria or other microorganisms ( which can cause disease)
Answer: A pathogen is usually defined as a microorganism that causes, or can cause, disease :)
Explanation:
There are different types of pathogens, but we're going to focus on the four most common types: viruses, bacteria, fungi, and parasites.
The lipid that makes up most of the lipids in our body is: Group of answer choices lecithin triglyceride phospholipid cholesterol
Answer:
triglyceride
Explanation:
the most common lipid.
why would a light wave speed up if it moved from air into hydrogen
which statement best describes why genetic variation is beneficial to populations of organisms A. Individuals look different from one another. B . Only one parent is needed to produce offspring. C. Populations of the organism increases more rapidly. D. Species can better survive environmental changes.
Answer:
Explanation:
Its D, species began having more beneficial adaptions to their environment causing them to live longer.
Answer:
It's D. Species can better survive environmental changes.
All matter is composed of very small particles called:
Answer:
Atoms
Explanation:
The ducts or tubes responsible for receiving the ovulated oocyte and providing the site for fertilization are the ________.
what are the levels of organization from simplest to most complex
Answer:
The biological levels of organization of living things arranged from the simplest to most complex are: organelle, cells, tissues, organs, organ systems, organisms, populations, communities, ecosystem, and biosphere
Explanation:
Hope This Helps
Happy Hoildays
~Zero~
Answer:
oops sry we kinda crashed your coms
Explanation:
The surge of blood entering arteries causes an expansion and recoil of the arterial wall producing a _____________ that can be felt externally.
Answer:
I think the answer you're looking for is pulse
If red blood cells are placed in distilled water and examined under a microscope
no cells are seen.
Explain why no red blood cells would be seen
Answer:
The distilled water made the red blood cells burst.
Explanation:
Distilled water is a hypotonic solution containing ZERO salt content. It is 100% water, making the red blood cells (RBC) take in water that causes the RBC to swell, then burst.
