The classification system for organisms has changed from seven to eight. this happened because
a. scientific consensus changed as scientists learned more about organisms.
b. scientist did not test the seven level system often enough to lead consensus.
c. the eight level system of classification is an emerging idea that needs more testing.
d. the seven level system of classification was not supported by scientist.

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.