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How does the endocrine system affect the body's functions? o o o o it secretes enzymes directly into the bloodstream. it secretes hormones directly into the bloodstream. it secretes enzymes through ducts to the surface of organs. it secretes hormones through ducts to the surface of organs.

Blood cells bring oxygen to cells and take carbon dioxide away. true or false

Viruses can cause the following, check all that apply. a. sore throat b. measles c. ear infection d. flu e. chicken pox