Animals are not an accurate environmental indicator as are plants, mainly because of their ________.
A) body temperature
B) lack of photosynthesis
C) cell structures
D) mobility
E) size
Question 2
________ is (are) one of the features distinguishing mammals from all other animal groups.
A) Warm blood
B) Milk production
C) Eyelids
D) Tongues
E) Toenails
