In an average ecosystem, about how much energy is present in the organisms at a given trophic level compared to the organisms at the next higher trophic level?
A) a tenth as much
B) half as much
C) twice as much
D) ten times as much
Answer: D
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The two strands of a DNA molecule contain nitrogen bases which are
A. identical. B. parallel. C. complementary. D. proportionate. E. random.
A specialization of the stomach that aids in grinding for animals that lack teeth is the ____
a. crop b. rumen c. cloaca d. gizzard e. esophagus
Skin cells typically do not divide. Indicate whether the statement is true or false
Trees often produce secondary chemicals to deter herbivores from feeding on their leaves; in turn, many herbivores have developed ways of avoiding or detoxifying these chemicals. This is an example of
A) competitive exclusion. B) coevolution. C) parasitic evolution. D) parasite predation. E) predatory avoidance.