单项选择题

It can be inferred from the passage that the decision to study an organism may sometimes be influenced by______.

A．its practical or commercial benefits to society
B．the nature and prevalence of its fossilized remains
C．the relative convenience of its geographical distribution
D．its similarity to one or more better known species
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单项选择题
It can be inferred from the passage that many zoologists assume that a large diversity among species of a given class of organisms typically leads to which of the following
A．Difficulty in classification.
B．A discontinuous fossil record.
C．A greater chance of survival over time.
D．Numerical abundanc
单项选择题
In the passage, the author is primarily concerned with______.
A．rejecting an earlier explanation for the longevity of certain brachiopod species
B．reevaluating the implications of uniformity among existing brachiopod species
C．describing the varieties of environmental change to which brachiopods are vulnerable
D．reconciling opposing explanations for brachiopods' lack of evolutionary success
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