Runs through core of osteon, contains blood vessels and nerve fibers.
What will be an ideal response?
Central (Haversian) canal
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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
Which were the first tetrapods to move to land?
A) Reptiles B) Ray-finned fishes C) Monotremes D) Hagfishes E) Amphibians
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
Viruses that attack bacteria are called
A. proviruses. B. virulent. C. phages. D. lytic.