Runs through core of osteon, contains blood vessels and nerve fibers.

What will be an ideal response?


Central (Haversian) canal

Biology & Microbiology

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Which one of the following is a signal that induces multicellularity of choanoflagellates?

A. the presence of predators in the environment B. the presence of the preferred prey/food source in the environment C. the developmental signal molecules that induce differentiation D. the cell migrations that take place in the developmental phases of growth

Biology & Microbiology

Which were the first tetrapods to move to land?

A) Reptiles B) Ray-finned fishes C) Monotremes D) Hagfishes E) Amphibians

Biology & Microbiology

Figure 24.4 In the accompanying figure, a(n) ____ has body plan B, which features a __________.

A. roundworm; pseudocoelom B. roundworm; coelom C. tapeworm; no body cavity D. annelid; coelom E. earthworm; pseudocoelom

Biology & Microbiology

Viruses that attack bacteria are called

A. proviruses. B. virulent. C. phages. D. lytic.

Biology & Microbiology