You have fractured your bone and your physician is explaining the healing process to you. She tells you that after the blood clot forms, the next step is the development of the callus. Which of the following describes the structure of the callus?
A) osteoclasts B) compact bone C) cartilage D) spongy bone
Answer: C
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Which evolutionary innovation was most significant in helping tetrapods move to dry terrestrial environments?
A) the lung B) the amniotic egg C) bone D) limb specialization E) endothermy
A form of mutation associated with the expansion in copy number of a nucleotide triplet in or near a gene is called a(n) ____________________
Fill in the blank(s) with correct word
Diatoms are mostly asexual members of the phytoplankton. Diatoms lack any organelles that might have the 9 + 2 pattern. They obtain their nutrition from functional chloroplasts, and each diatom is encased within two porous, glasslike valves
Which question would be most important for one interested in the day-to-day survival of individual diatoms? A) How do diatoms get transported from one location on the water's surface layers to another location on the surface? B) How do diatoms with their glasslike valves keep from sinking into poorly lit waters? C) How do diatoms with their glasslike valves avoid being shattered by the action of waves? D) How do diatom sperm cells locate diatom egg cells?
The major site of sensory processing in the brain is the
A. hypothalamus. B. brain stem. C. cerebellum. D. thalamus.