B. A food chain has limitations with the organisms involved
Answer:
Hypothesis
Explanation:
A hypothesis is a statement/guess of what the results of an experiment will display.
Answer : Endocrine glands secrete hormones into the blood stream while exocrine glands have ducts and secrete non hormonal substances such as tears or oil or sweat. Hormones are chemicals responsible for regulating the metabolic functions of cells in the body and drain into the bloodstream and the lymphatic system.
Explanation:
It is important that your heart goes back to resting level because if it doesn't , it might overwork itself and destroy itself.<span />