Which step of the nitrogen cycle is not performed by most bacteria?
a. ammonification
b. denitrification
c. assimilation
d. nitrogen fixation
e. nitrification
C
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Which statement best characterizes the life cycle of cnidarians?
A. All species have both polyps and medusae. B. Some have only polyps, some have both polyps and medusae, and others have medusae and a reduced polyp stage. C. Some species have only medusae and others have both polyps and medusae. D. Some species have only polyps and others have both polyps and medusae. E. Some species have polyps and others have medusae, but no species has both.
Emergent properties are
a. characteristics of nonliving matter. b. exclusive to atoms but not molecules. c. neither exclusive to molecules nor compounds. d. characteristics that depend on the level of organization of matter but do not exist at lower levels of organization. e. exclusive to multicellular organisms.
Which form of selection is most likely to contribute to speciation over time?
a. stabilizing selection b. directional selection c. diversifying selection d. sexual selection
Density-dependent population regulation occurs only at high population densities
Indicate whether the statement is true or false