PART III 
HUMAN BIOLOGY 
CHAPTER XXX 
RESEMBLANCES BETWEEN MAN AND THE OTHER 
ANIMALS 
324. Man as an Animal. — In our study of animals and 
plants, the life processes have been emphasized. We have 
found that each living thing can be analyzed according to the 
place where it lives and its food habits ; its structures used in 
securing life-giving oxygen and removing wastes; its organs 
for responding to light, heat, cold, sound, etc.; and finally 
its methods of producing more living things like itself. We 
also found in plants an additional life process, the ability 
to manufacture their own food from the uncombined and 
non-nutritious elements in the air and soil. As we approach 
the study of man, we naturally ask how all these facts that 
we have learned about animals and plants help us to under¬ 
stand how man lives. 
One of the best ways to learn about man is to study his 
life processes just as we did the grasshopper’s and the frog’s. 
In such a study we may omit the comparison with plants 
except incidentally, because man is an animal in all the 
points in which our comparison is to be made, and the simi¬ 
larities between animals and plants have already been em¬ 
phasized on pages 4-8. This does not imply that man is 
nothing more than an animal, but simply that in many 
features of his life he lives as animals live. 
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