Secondary sexual characteristics
A) may develop in response to testosterone.
B) may develop in response to estrogen.
C) are usually apparent at birth.
D) may develop in response to testosterone or estrogen.
E) None of the answers is correct.
Answer: D
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a. elastic fibers in the lung. b. surface tension of the fluid lining the alveoli. c. pulmonary surfactant. d. both (a) and (b) above. e. all of these answers.
Ossification that involves replacing cartilage with bone is ________.
A. intramembranous B. interstitial C. osteomalacia D. appositional E. endochondral
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What cell gives rise to all formed elements?
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