Which explains why it is important to eat a full healthy meal before an afternoon of playing sports?

A. Food provides the carbon dioxide that is a product of cellular respiration.
B. Food provides the oxygen that is a product of cellular respiration.
C. Food provides the glucose that is a reactant in cellular respiration.
D. Food provides the energy that is a reactant in cellular respiration.

Hormones are chemical molecules produced by endocrine glands. one such endocrine gland is the thyroid gland, which synthesizes the thyroid hormone, which in turn affects the heart muscles. which two statements describe the probable reason for the function of the hormone? the cells in the heart have specific receptors that allow for the intake of hormones. the heart and the endocrine glands have the exact same types of cells. all cells make the same types of hormones. thyroid hormones show their effect on the heart by means of specialized cells. thyroid cells and cardiac cells have different dna.

What type of appendages do sponges cnidarians roundworms annelids mollusks arthropods echinoderms and vertebrate have? jointed, not jointed, absent  

14. which of the following codons code for threonine? a. ucg b. ugu c. cga d. aca