The first lungs evolved from outpouchings of the gut wall in some:
a. bony fishes
b. amphibians
c. birds
d. reptiles
e. early mammals
a
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Which enzyme is used by RNA viruses to directly replicate the viral RNA genome?
A. RNA-dependent DNA polymerase B. DNA-dependent RNA polymerase C. Reverse Transciptase D. RNA-dependent RNA polymerase
The testes of a male differ from the ovaries of a female in that the testes
a. develop in the body cavity and migrate to a position outside of the body cavity. b. require a slightly higher temperature than that of the body to produce viable gametes. c. produce zygotes. d. do both a and b.
Components of the first line of defense include all the following, except
A. nasal hairs. B. phagocytic white blood cells. C. flushing action of tears and blinking. D. flushing action of urine. E. the tough cell sheet of the upper epidermis of the skin.
Studying the total amount of oxygen generated and released into the atmosphere by living things would be an example of studying ecology at which level?
A) ecosystem B) community C) population D) biosphere