The left ventricle works harder than the right ventricle because it has to .

A.
squeeze carbon dioxide from the blood
B.
send the blood to both lungs
C.
push the blood through the whole body
D.
push the blood back into the heart

Use the drop-down menu to match the following definitions to the corresponding terms. the total variety of organisms that live in the biosphere a group of organisms that breed and produce offspring that can breed all of the biotic and abiotic factors in an area

Many animals cannot sweat to maintain a stable body temperature. what is one other way animals can cool down?

Witch theory suggests all living things are made up of cell or cells