The hole in the ozone layer is most dramaticover:a
Antarctica.
b. North America.
c. Asia
d. Europe.
e. Africa.
A
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Which of the following stimulate macrophage differentiation and activation?
A) granulocyte-monocyte colony stimulating factor B) interferon gamma C) tumor necrosis factor-alpha D) granulocyte-monocyte colony stimulating factor, interferon gamma, and tumor necrosis factor-alpha
The largest mass extinction occurred at the end of the:
A. Ordovician. B. Devonian. C. Permian. D. Triassic. E. Cretaceous.
The ____ have a single, circular chromosome
a. Archaea b. Bacteria c. Archaea and Bacteria d. cyanobacteria only e. methanogens only
Electrons are shared in bonds that are
a. covalent. b. polar. c. nonpolar. d. covalent, polar, or nonpolar. e. covalent, but not polar or nonpolar.