The oxygen, O2, and hydrogen sulfide, H2S, molecules are about the same size and they also have about the same degree of polarity. This helps to explain why
A) the body survives when breathing H2S just about as well as it does when breathing O2.
B) H2S is such a smelly compound while O2 has no smell.
C) the Earth's ancient atmosphere was once abundant with H2S.
D) cells absorb H2S just as easily as they absorb O2.
D
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From a scientific point of view, which of the following is true?
A. Evolution leads to survival of the strongest. B. Evolution leads to survival of the most valuable. C. Organisms develop traits because they need them. D. Fitness is a matter of reproductive success. E. Evolution follows a plan of nature.
The total number of plant and animal species that a field biologist identifies along a mountain trail is an example of ________
A) species richness B) structural diversity C) genetic diversity D) species evenness E) species composition
Pesticide resistance
A. has arisen only among insects. B. has arisen in hundreds of species. C. has emerged in a few species but more cases are expected. D. used to be a problem but modern pesticides are typically not susceptible to this problem.