The demand on the earth's lithosphere is dramatically increasing. why should we look for alternative sources of energy other than just relying on fossil fuels? a) fossil fuels are non-renewable and exhaustible and their combustion causes air pollution. b) fossil fuels are renewable and plentiful, but their combustion causes air pollution. c) fossil fuels are plentiful, so alternative sources are not needed. d) fossil fuels are not profitable for energy companies.

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.