One cause of osteoporosis is overactive osteoclasts. Therefore, osteoporosis is a disease in which too much bony matrix a. is dissolved
b. is deposited
c. is converted to compact bone
d. is converted to spongy bone

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Me d: which system contains the heart, blood, and blood vessels? a. muscular b. circulatory c. respiratory d. digestive which system contains the pituitary, adrenal, and thyroid glands? a. respiratory b. circulatory c. endocrine d. reproductive