One adaptation to flight in birds is lighter bones, which lack

A. medullary cavities.
B. collagen.
C. the periosteum.
D. bone marrow.
E. calcium.


Answer: D

Biology & Microbiology

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The brain perceives the pitch of a sound based on the

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Which of the following is not a lobe of the cerebral hemisphere?

A. reticular B. occipital C. temporal D. frontal E. parietal

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Which of the following organisms would be considered heterotrophs?

a. most bacteria b. plants c. hydrogen bacteria d. dogs e. most bacteria and dogs

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Which of the following must occur before cell division begins?

a. duplication of the nucleus b. DNA replication c. cytokinesis d. DNA segregation

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