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krek1111 [17]
4 years ago
13

The opening between the right atrium and the right ventricle is controlled by the

Biology
1 answer:
FromTheMoon [43]4 years ago
3 0
I think the answer is the vitral valve..dbl check plse..
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In which form do plants store energy?<br> starch<br> glycogen<br> chitin<br> cellulose
Viefleur [7K]

Answer:

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Explanation:

plant store energy in the form of starch and animal store energy in the form of  glycogen these starch and glycogen are converted into glucose whenever body needs energy

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During exercise, energy demand in the muscle increases. Which other body system directly provides for this demand
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The body system that directly provides for this demand is the circulatory system. When you exercise, the circulatory and muscle system cooperate, in order to meet the increased needs for strength and energy. The circulatory system involves the network which delivers blood to every part of your body. This flowing of blood ensures that the tissues are oxygenated and rich in necessary nutrients. During exercise, more blood flows to and from your muscles, in order to deliver the necessary amounts of oxygen to complete the aerobic respiration.
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When air gets warm does it sink or rise?
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4 0
3 years ago
Reasons for seasons<br>​
Sergio039 [100]

Answer:

As the earth spins on its axis, producing night and day, it also moves about the sun in an elliptical (elongated circle) orbit that requires about 365 1/4 days to complete. The earth's spin axis is tilted with respect to its orbital plane. This is what causes the seasons. At different times of the year, the sun's rays hit different parts of the globe more directly. The angle of the Earth's axis tilts the Northern Hemisphere towards the sun during the summer. Without the tilt of the earth's axis, we wouldn't have seasons.

Explanation:

Hope this helps!

7 0
3 years ago
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