The bony or cartilaginous cranium in chordates is adaptive because it
A. develops into the postanal tail.
B. protects the brain.
C. allows movement, as a lightweight exoskeleton structure.
D. replaces the notochord in most chordates.
E. forms the vertebrae.
B. protects the brain.
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What happens to CDK in the absence of cyclin?
A. It is inactive. B. It is degraded. C. It becomes phosphorylated. D. Answers a and c are both correct.
The spinal cord runs through the vertebral column and connects with the brain through the
__________. Fill in the blank(s) with the appropriate word(s).
Which of the following statements about bird
song is false? a. It is an instinctive behavior. b. The bird nervous system is prewired to recognize the species song. c. A sparrow that is not tutored early in his life can learn the correct song as an adult. d. Rendition of the species song is influenced by acoustic input during a sensitive period. e. All of these are true
Fungi may be differentiated from plants because fungi are:a
photosynthetic. b. all macroscopic. c. all multicellular. d. heterotrophic. e. all prokaryotic