. Beginners' Zoology . squirrel. * Giraffe, leopard, camel. , cat, cow. Why ?Check the five mammalsin the following lists thatform a group resemblingone another most closely:Lion, bear, pig, dog, squir-rel, cat, camel, tiger, your reasons. Gi-raffe, leopard, deer, cow,rat, camel, hyena, horse,monkey. State reasons. Teeth and Toes are the basis for subdividing the class mammalia into orders. Although the breathing, the circulation, and the internal organs and processes are similar in all mammals, the externaL „, . • ^ ^ Fig. 341. — Weasel, m summer; m Canada organs var
. Beginners' Zoology . squirrel. * Giraffe, leopard, camel. , cat, cow. Why ?Check the five mammalsin the following lists thatform a group resemblingone another most closely:Lion, bear, pig, dog, squir-rel, cat, camel, tiger, your reasons. Gi-raffe, leopard, deer, cow,rat, camel, hyena, horse,monkey. State reasons. Teeth and Toes are the basis for subdividing the class mammalia into orders. Although the breathing, the circulation, and the internal organs and processes are similar in all mammals, the externaL „, . • ^ ^ Fig. 341. — Weasel, m summer; m Canada organs vary greatly because in winter it is all white but tip of tail. of the varying environ-ments of different species. The internal structure enablesus to place animals together which are essentially alike; whale and man are both mammals, since they resemblein breathing, circulation, and multiplication of external organs guide us in separating the classinto orders. The teeth vary according to the food. X92 BEGINNERS ZOOLOGY
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