HELP!!/ Why are fossil fuels considered nonrenewable resources? A. They create pollution and people have to clean it up. B. They are found underground and must be processed. C. They cannot be found in nature and have to be made. D. They cannot be replaced as fast as they are being used

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.

In order to study genetic mutations, scientists must study genetic material. which statement describes the genetic material scientists are most likely studying? a) they study alleles that contain chromosomes, which are rna.b) they study alleles that contain genes, which are chromosomes.c) they study chromosomes that contain genes, which are dna segments.

Up to what percentage of the world's flora consisted of cycads during the triassic period? 100% 75% 50% 20%