Which should be the best teaching aid to introduce the warm-blooded animals?

Options

A. (a) Life cycle chart of a frog
B. (b) Life cycle model of a hen
C. (c) Real butterfly
D. (d) The dog sitting outside the classroom

Answer

D

Explanation

Warm-blooded creatures, like mammals and birds, try to keep the inside of their bodies at a constant temperature. They do this by generating their own heat when they are in a cooler environment and by cooling themselves when they are in a hotter environment.