Answer:
through two large veins, the inferior and superior vena cava, emptying oxygen-poor blood from the body into the right atrium.
Explanation:
Answer:
The innermost layer of the atmosphere is TROPOSPHERE.
Explanation:
Atmosphere - The gaseous surroundings of earth is known as atmosphere. On the basis of variations in temperature, atmosphere has several layers as follows-
<u><em>Troposphere</em></u>- <em><u>It is the innermost layer of the earth. extending 17 km above sea level at the equator and about 7 km above the earth's poles</u></em>.Weather phenomenon occurs in this layer.It is known as troposphere because of vigorous air current.
<u><em>Stratosphere- </em></u>It is the second layer above troposphere.It extends approx 50 km above the earth surface.Ozone is also found in this layer. ozone plays very important role in maintaining thermal balance.
<u><em>Mesosphere-</em></u> It is the third layer of earth surface.Extending approx 50 to 85 km above the earth.Here temperature remains low.And at the top of this layer i.e, mesopause has the coldest temperature.
<u><em>Thermospher-</em></u> Temperature in this region is slightly high because of absorption of solar light.
<u><em>Exosphere-</em></u> It is the outer most layer of earth. Any particle or object in this layer if moving very fast can escape to the space. The <u>exopause</u> boundary of exosphere is approx 250-500 km above the surface. This is the transition layer between earth atmosphere and space