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Vilka [71]
3 years ago
7

Why is the SA node called the pacemaker of the heart?

Biology
1 answer:
defon3 years ago
6 0
It sends electrical impulses that cause the muscles of the heart to contract. It literally sets the rate of contractions, or in other words it controls the pace
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Explain the relationship between crossing over and genetic variation
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A variation is a reference to the differences or deviations, such as the structure and form, as for crossing over is the exchange of genetic material between the non-sister chromatids of the homologous chromosomes during meiosis.
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The Venn diagram compares aerobic respiration and anaerobic respiration.
satela [25.4K]
Produces water should be in the only aerobic section of the diagram. Aerobic respiration end products are carbon dioxide and water. Anaerobic respiration end products are lactic acid in animals and carbon dioxide and ethanol in yeast and plants. (: 
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Natural selection is best described as
nirvana33 [79]
Hello,

The answer is "natural selection is how animals, or plants survive or adapt to their environment".

Reason:

Natural selection is how animals, or<span> plants survive or adapt to their environment this idea came up by Charles Darwin and how he examined the birds beaks which means he came up with the theory of evolution which means that animals evolve to a different type of that species to adapt to there environment with is natural selection.

If you need anymore help feel free to ask me!

Hope this helps!

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8 0
3 years ago
I NEED HELP PLEASE!!!11-12
liberstina [14]

Answer:

11. Centrioles, asters, and spindles are mitotic structures responsible for pulling apart the sister chromatids.

12.The centriole

Explanation:

8 0
2 years ago
Why was helium and hydrogen the first elements to show up in the universe?
laiz [17]

Hey there! I could help you out with your question.

°.✩┈┈┈┈∘*┈┈୨♡୧┈┈*∘┈┈┈┈✩.°

According to research it claims that "Within about 3 minutes after the Big Bang, conditions cooled enough for these protons and neutrons to form hydrogen nuclei. ... This is when recombination occurred — neutral hydrogen (and helium) finally appeared because they could “recombine with” (hold on to) electrons without easily losing them to stray radiation."The Big Bang created the elements on the periodic table, building blocks that help make up the universe. ... In stars, hydrogen atoms fuse to create helium — the second most common element in the universe, according to Encyclopedia.com. Helium has two protons, two neutrons and two electrons. Hydrogen is known to be the first element in the periodic table of elements. It has one proton in its nucleus and one outter electron. It is a very light gas and also flammable. ... Its atomic symbol is H and its atomic number is one.

°.✩┈┈┈┈∘*┈┈୨♡୧┈┈*∘┈┈┈┈✩.°

Hope this helps .+(´^ω^`)+.

5 0
2 years ago
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