Answer:
that's very broad, is that the whole question?
Answer:
Gravity is the force by which a object or other body draws objects toward its center.
Explanation:
If I toss a ball into the air gravity will influence it and bring it towards its center, in this case the ground.
Oxygen and carbon dioxide is exchanged by the millions of alveoli in the lungs and the capillaries that envelop them. we inhale oxygen (which is then exchanged with carbon dioxide in the lungs) and then we exhale the carbon dioxide. although, the air that we breathe usually consists more nitrogen than oxygen.
Answer:
"Endocrine Organs and the Nervous system II. Nerves and hormones work together to regulate function of the human digestive system; they control muscular contractions and the rate of secretion from digestive organs. ... Several hormones coordinate digestive functions of the stomach, pancreas and gall bladder."
Explanation: :)
Because they only pull not push and we need something to push