A) which side of the heart collects blood from the body and pumps it to the lungs?
b) which chamber receives blood from the lungs?
c) which ventricle is more muscular, the left or the right? explain.
d) a valve is like a “one way street” in the heart that prevents blood from flowing backward. there is a valve between the atrium and ventricle on both the right and left sides of the heart. why do you think valves are important in the circulatory system?
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Answer and Explanation:

a) which side of the heart collects blood from the body and pumps it to the lungs?  The right side of the heart via the vena cava receives blood from the body organs into the right atrium. The resulting pressure forces the tricuspid valve to open and blood gets into the right ventricle.

b) which chamber receives blood from the lungs?

The left atrium through the pulmonary vein receives blood from the lungs.It then flows into the left ventricle through bicuspid valve.

c) which ventricle is more muscular, the left or the right? Explain.

The walls of the left ventricle is thicker than the wall of the right ventricle because the left ventricles pump blood under high pressure to the rest of the body and the left ventricle pumps blood a longer distance hence requires more force.

d) a valve is like a “one way street” in the heart that prevents blood from flowing backward. There is a valve between the atrium and ventricle on both the right and left sides of the heart. Why do you think valves are important in the circulatory system? The valves prevent back flow of blood into the ventricles when the ventricles relax.

the oldest known insects are believed to live around 400 millions ago as suggested by the fossil records.   some plants having woody stems also evolved during this time.

after the evolution of insects the first four legged species or the tetrapods evolved in shallow freshwater habitats from the intermediate species approximately 397 million years ago. the tetrapods went on conquering the land giving rise to amphibians, reptiles, mammals and birds.

the major split in tetrapods first occurred 340 million years ago branching off from amphibians.

363 million years ago when the carboniferous period began the insects started roaming on land and taking flights, following which the four limbed tetrapods adapted in the terrestrial habitat.