Scientists have studied atmospheric conditions over the last century and have noted that the
atmospheric carbon dioxide level has __________ and global temperatures have __________.
a. decreased; decreased
b. decreased; increased
c. increased; decreased
d. increased; increased
D
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As population density increases, the chance of
____ also increases.
a. pathogens b. parasitism c. predation d. competition e. all of these
The term oxidation is derived from the name of the element oxygen. This is reasonable, because oxygen
A. attracts electrons very strongly. B. can be oxidized by accepting electrons. C. contains more electrons than are needed. D. passes electrons to many other types of molecules.
________________ is directional growth responses of plants to a unidirectional source of light.
A. Gravitropism B. Thigmotropism C. Dormancy D. Phototropism E. Thermotropism
Morphological characteristics are widely used for taxonomic classifications because they are ____
a. the most likely indicators of evolutionary relationships b. the most likely to represent reproductive isolation among groups c. easy to assess in living, preserved, or fossilized specimens
d. always the exact phenotypic expression of genotypes e. indicative of genetic relatedness