By Examining the fin of a primitive fish, scientists have found similarities in bone structure to that of modern-day reptiles, birds, and mammals. What type of evidence does this describe? A. Vestigial structures
B. Embryonic structures
C. Analogous structures
D. Homologous structures

How does a lytic infection differ from a lysogenic infection?

In the water cycle , when does water undergo a chemical change

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.