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 is correct
Correct Answer:
Verified
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.
Q13: A grazing animal,such as a cow,that mainly
Q14: Mammals belong to the
A)anapsid lineage.
B)synapsid lineage.
C)diapsid lineage.
D)polydont
Q15: Although there are exceptions,which of the following
Q17: Some northern mammals have a white winter
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
Q21: Hares,rabbits,and some rodents pass food through their
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