In humans, structures that show developmental homology with other chordates are
A. the eyes and nostrils.
B. gill ridges and a bony tail.
C. fore and hindlimbs.
D. the lungs and vertebrae.
B. gill ridges and a bony tail.
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Which of the following gases was not present in the Earth's early atmosphere but appeared after the
evolution of certain organisms? a. hydrogen b. methane c. nitrogen d. oxygen e. carbon dioxide
In the United States, the largest group of endangered species is:
a. mammals. b. flowering plants. c. insects. d. birds. e. amphibians
Which enzyme is used by RNA viruses to directly replicate the viral RNA genome?
A. RNA-dependent DNA polymerase B. Reverse transciptase C. DNA-dependent RNA polymerase D. RNA-dependent RNA polymerase
What is the best way to distinguish male from female?
A) Males are larger. B) Males are more brightly colored. C) Males are more aggressive. D) Males produce motile gametes. E) Females produce offspring.