Fundamental similarity due to descent from a common ancestor is called
A. homology.
B. commonality.
C. analogy.
D. convergence.
E. Both analogy and convergence are correct.
Answer: A
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An organism with a temperature growth optimum near 80°C and a pH growth optimum between two and three is usually referred to as a(n) ________.
A. thermophile B. halophile C. thermoalkalophile D. thermoacidophile
Cephalization is
A. embryonic development of the head in advance of the rest of the body. B. concentration of the sensory organs on the posterior end of the body. C. concentration of the sensory organs on the anterior end of the body. D. an evolutionary degeneration of the head as seen in some parasites. E. a malformation of the head.
Which structure, A, B, C, or D, is the developing neural tube?
1.A
2.B
3.C
4.D
Nerve impulses cannot reverse and travel up the axon toward the cell body due to _____
the refractory period the resting potential the action potential summation