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katovenus [111]
3 years ago
6

What is true about heart valves?

Biology
1 answer:
NemiM [27]3 years ago
8 0
C.they separate atria from ventricles, and ventricles from the large arteries that leave them.
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ancestors of giraffes with shorter necks could not reach branches high up in trees for food. this led to selection for longer-ne
hichkok12 [17]

With shorter necks, giraffe ancestors could not reach food-containing branches on tall trees. This resulted in the directional selection of giraffes with longer necks.

 

<h3>Why is choosing a direction necessary? </h3>

It nearly appears obvious that the giraffe's long neck developed as a result of a lack of food in the lower branches of trees. The giraffe has a significant advantage because it is taller than any other mammal and can feed where few others can. 

When compared to modern giraffes, the giraffe's ancient predecessors had a shorter neck. The plants that were lying at a higher level were inaccessible to them. Giraffe phenotypes have changed in various ways, and now have long necks to reach vegetation that is higher up. The extreme form is chosen above other features in directional selection. It was decided to choose the long-necked giraffe over the short-necked.

 

To know more about direction selection for longer necked giraffes visit:

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7 0
1 year ago
What part of DNA determines traits?
makvit [3.9K]

Answer:

The traits of a living thing depend on the complex mixture of interacting components inside it. Proteins do much of the chemical work inside cells, so they largely determine what those traits are. But those proteins owe their existence to the DNA (deoxyribonucleic acid), so that is where we must look for the answer.

7 0
2 years ago
The arctic hare on the left and the jack rabbit on the right are adapted to
Zielflug [23.3K]

Answer:

B. Release body heat

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Jackrabbits live in deserts, and therefore must release excess body heat through the surface area of their ears to avoid quickly overheating and dying.

4 0
3 years ago
Read 2 more answers
Summary
Anettt [7]
3 or 2 1 would not make sense
5 0
3 years ago
if god made all this planets and we are the only one with live on it then does that mean there is other life out there some wher
yan [13]
Well there is in fact other life in outer space but in the form of bacteria
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