Earth has experienced _______________ ice ages over the past two million years
Fill in the blank with correct word.
ANSWER: 20, twenty?
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An example of point source pollution is
A. runoff from cropland. B. fertilizer runoff from lawns. C. litter from fishing boats. D. runoff from cropland. E. a drainpipe from a factory.
If you are walking through a forest dense with oak and hickory trees and thick with leaf litter underfoot, you would assume you are in a
a. tropical savanna b. temperate deciduous forest c. tropical rain forest d. temperate rain forest e. coniferous forest
Which of the following regions could be classified as arid:
a. hot and dry b. warm and dry c. cold and dry d. all of the above
Class I MHC molecules do which if the following?
A) pick up dead antigens B) seek out antigen molecules that have been synthesized inside a virus infected cell C) both a and b D) neither a nor b