1.
3.2.2 quiz: matter and energy
question 1 of 10
2 points
which statement best describes the law of conservation of energy?
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a. energy can change forms but cannot be created or destroyed.
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b. energy can be destroyed but not created.
c. the total energy in an open system can only decrease.
d. energy can be created but not destroyed.

Which of these resources is used worldwide to make construction products, pottery, and porcelain

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.

Which statement describes compounds a. compounds are made of one type of atom. b. compounds cannot be represented by models. c. compounds are represented by chemical formulas. d. compounds cannot be broken down into simpler forms.