Plant community structure along an environmental gradient can often be explained by
A) differences among species in their competitive abilities.
B) differences among species in their abilities to tolerate stress.
C) differences among species in their resistance to herbivores.
D) a trade-off among species with respect to competitive ability and stress tolerance.
D
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The molecule in the accompanying figure is glyceraldehyde, an example of a ____ sugar
a. triose b. hexose c. pentose d. heptose e. tetrose
Caribbean seagrasses are extensively fed on by all except
a. manatees. b. green sea turtles. c. some sea urchins. d. sea cucumbers.
The distribution of epibenthic organisms on hard bottom sediments is: a. uniform
b. patchy. c. structured. d. random.
____ are examples of trace fossils.
A. Skeletons B. Shells C. Seeds D. Footprints E. Leaves