21. what is biodiversity? 22. describe the water in an estuary. 23. what bodies of water have the highest biodiversity? 24. where does an organism live if it is a terrestrial organism? 25. make a flow chart of the water cycle beginning with the sun providing energy for heat. 26. where does most of our drinking water come from? 27. why do we monitor our water supply? 28. what man made problems would cause water levels to decrease in a city? 29. what is the dominant physical feature of planet earth? 30. what is the water table?

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.