White fur of winter animals is due to
A) albinism, where a recessive gene blocks formation of pigments.
B) chromatophores, just as occurs in amphibians and reptiles that change their colors.
C) leukemism, a simple seasonal change in pigment.
D) aging of hair follicle cells induced by cold temperatures.
E) None of the choices are correct
Correct Answer:
Verified
Q1: The specialized hairs on the nose that
Q4: Which is NOT a correct association of
Q6: True horns are
A)the same as antlers.
B)restricted to
Q9: Mammals began a dramatic expansion in the
A)Pleistocene.
B)Paleocene.
C)Oligocene.
D)Triassic.
E)Eocene.
Q11: The only therapsid group which survived to
Q12: The teeth of mammals are
A)homodont.
B)placoid.
C)diphyodont.
D)polydont.
E)continuously replaced.
Q15: Although there are exceptions,which of the following
Q18: The earliest mammals
A)were endothermic,although probably not as
Q19: Rhinoceros horns differ from other horns or
Q20: Mammals have a variety of teeth specialized
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