In vertebrates, the dorsal nerve cord evolved into a brain and spinal cord, which together constitute which of the following?
A. Central nervous system
B. Brain
C. Cephalization
D. Peripheral nervous system
E. Autonomous nervous system
Answer: A
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Nitrogen gas is first converted into ___ by
certain___ before it enters the land nitrogen cycle.
a. nitrate...bacteria b. ammonium...bacteria c. elemental nitrogen...bacteria d. nitrate...bacteria and fungi e. ammonium...bacteria and fungi
A gill is indicated by letter
a. A. b. B. c. C. d. D. e. E.
What is suggested by the hypothesis of punctuated equilibrium?
A) There's been no change in life on Earth. B) There's been gradual and steady change in life on Earth. C) There have been short periods of dramatic evolutionary change separated by long periods of no change. D) Life on Earth changes dramatically most of the time, but there are short periods when there's no change.
Explain the relationship between ozone depletion and rising incidence of skin cancer.
What will be an ideal response?