It is evident, for example, that the amphibians and the cetaceans, living habitually in a dense medium, where well developed limbs would only be able to interfere with their movements, must have only very shortened limbs, that it is only as a result of the influence of the water impeding movements of very long limbs with solid interior parts, that they necessarily are made the way they really are, and that consequently these animals owe their general form to influences of the environment in which they live.
(the amphibians and the cetaceans; living habitually; L:in a dense medium) (the way; really are; they) (it; is; only as a result of the influence of the water impeding movements of very long limbs with solid interior parts) Context(it is,List([227, 232))):(they; necessarily are made; ) (well developed limbs; would only be; able to interfere with their movements; L:a dense medium) (they; live; L:the environment) (well developed limbs; to interfere; with their movements)
it is,List([227, 232))
the amphibians and the cetaceans the way it they well developed limbs they well developed limbs
living habitually really are is necessarily are made would only be live to interfere
L:in a dense medium
they
only as a result of the influence of the water impeding movements of very long limbs with solid interior parts
able to interfere with their movements L:a dense medium
L:the environment
with their movements