Some people say that China’s number one export is air pollution. This is because
a. large countries have a higher population, and therefore, more cars and machinery to
produce pollutants.
b. many countries do not have monitored emission standards.
c. wind patterns bring smog from China to the West Coast of the United States.
d. all of these
D
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During muscle contractions, ____
a. the sarcomeres lengthen b. the actin and myosin filaments slide in the same direction c. the actin filaments move toward the middle of the sarcomere d. the muscle fibers elongate e. the muscle fibers are motionless
All cases of altruism (along with some cases of mutual benefit) in which we find behaviors that are selected for because they are beneficial to the recipient are collectively known as ________
Fill in the blank(s) with correct word
he nervous system of many species of flatworms:A
consists of a single, large ganglion in the anterior end. B. is sometimes referred to as tubelike. C. includes two dorsal nerve cords. D. is diffuse and netlike. E. is a “ladder-type.”
By definition, an indirect parasitic life cycle includes two different species of hosts to complete its life cycle
a. true b. false