GRE考试

【多选题】Both plants and animals of many sorts show
remarkable changes in form, structure, growth
habits, and even mode of reproduction in
Line becoming adapted to a different climatic envi-
(5) ronment, type of food supply, or mode of liv-
ing. This divergence in response to evolution is
commonly expressed by altering the form and
function of some part or parts of the organism,
the original identity of which is clearly dis-
(10) cernible. For example, the creeping foot of the
snail is seen in related marine pteropods to be
modified into a flapping organ useful for
swimming, and is changed into prehensile
arms that bear suctorial disks in the squids
(15) and other cephalopods. The limbs of various
mammals are modified according to several
different modes of life for swift running
(cursorial) as in the horse and antelope; for
swinging in trees (arboreal) as in the monkeys;
(20) for digging (fossorial) as in the moles and
gophers; for flying (volant) as in the bats; for
swimming (aquatic) as in the seals, whales, and
dolphins; and for other adaptations. The
structures or organs that show main change in
(25) connection with this adaptive divergence are
commonly identified readily as homologous,
in spite of great alterations. Thus, the finger
and wrist bones of a bat and whale, for
instance, have virtually nothing in common
(30) except that they are definitely equivalent ele-
ments of the mammalian limB、
Directions: For the following question, consider each question separately and select all that apply.

网考网参考答案：A、C
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