Question 1

White fur of winter animals is due to

Accepted Answer

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 correctF) C) and D)
G) A) and B)

Question 2

The fertility cycle of the female mammal is referred to as the ___________ cycle.

Accepted Answer

The answer of The fertility cycle of the female mammal...

Question 3

Give evidence that suggests that a chorioallantoic placenta was present in the common ancestor of marsupials and placental mammals,but later was lost in most marsupials.

Accepted Answer

One piece of evidence that suggests a ch...

Question 4

The North American mammal that shows 10-year cycles in population density,and that is preyed upon by lynx and other predators,is the ______ ______.

Accepted Answer

The answer of The North American mammal that shows 10-year...

Question 5

The specialized hairs on the nose that are tactile in function (used to "measure" width of passageways,etc. ) are

Accepted Answer

A)  guard hairs.
B)  underfur.
C)  vibrissae.
D)  quills.
E)  filamentous hairs.F) D) and E)
G) B) and C)

Question 6

During their annual growth,antlers develop beneath a covering of highly vascular skin called ___________.

Accepted Answer

The answer of During their annual growth,antlers develop beneath a...

Question 7

The adaptive diversification of early mammals was due to

Accepted Answer

A)  their homeothermic advantage.
B)  their metabolic efficiency that allowed lower food consumption per unit of body mass.
C)  the independence of their young.
D)  the extinction of many competing amniote groups at the end of the Cretaceous.
E)  their larger size which made them better predators.F) C) and E)
G) A) and B)

Question 8

The only therapsid group which survived to enter the Mesozoic was the

Accepted Answer

A)  cynodonts.
B)  pelycosaurs.
C)  sphenacodontines.
D)  theropods.
E)  mesopods.F) B) and D)
G) A) and E)

Question 9

Why should the loss of lumbar ribs in cynodonts be correlated with the evolution of a diaphragm? What else may have been provided by the loss of lumbar ribs in this lineage?

Accepted Answer

The loss of lumbar ribs in cynodonts may...

Question 10

Hair is produced by the ___________ layer of the skin.or

Accepted Answer

The answer of Hair is produced by the ___________ layer...

Question 11

Hair is produced by the layer of skin called the __________.

Accepted Answer

The answer of Hair is produced by the layer of...

Question 12

Discuss the significance of the evolution of echolocation in bats.Could that partially explain why bats are the most diverse group of mammals today?

Accepted Answer

The evolution of echolocation in bats ha...

Exam 28: Mammals

The fertility cycle of the female mammal is referred to as the ___________ cycle.

Correct Answer
verified

Why should the loss of lumbar ribs in cynodonts be correlated with the evolution of a diaphragm? What else may have been provided by the loss of lumbar ribs in this lineage?

Correct Answer
Answered by ExamLex AI
The loss of lumbar ribs in cynodonts may...
View Answer

The only therapsid group which survived to enter the Mesozoic was the

Correct Answer
verified

Discuss the significance of the evolution of echolocation in bats.Could that partially explain why bats are the most diverse group of mammals today?

Correct Answer
Answered by ExamLex AI
The evolution of echolocation in bats ha...
View Answer

Hair is produced by the ___________ layer of the skin.or

Correct Answer
verified

The North American mammal that shows 10-year cycles in population density,and that is preyed upon by lynx and other predators,is the .

Correct Answer
verified

The adaptive diversification of early mammals was due to

Correct Answer
verified

The specialized hairs on the nose that are tactile in function (used to "measure" width of passageways,etc. ) are

Correct Answer
verified

Give evidence that suggests that a chorioallantoic placenta was present in the common ancestor of marsupials and placental mammals,but later was lost in most marsupials.

Correct Answer
Answered by ExamLex AI
One piece of evidence that suggests a ch...
View Answer

Hair is produced by the layer of skin called the __________.

Correct Answer
verified

White fur of winter animals is due to

Correct Answer
verified

During their annual growth,antlers develop beneath a covering of highly vascular skin called ___________.

Correct Answer
verified

Exam 28: Mammals

The fertility cycle of the female mammal is referred to as the ___________ cycle.

Correct AnswerverifiedShow Answer

Why should the loss of lumbar ribs in cynodonts be correlated with the evolution of a diaphragm? What else may have been provided by the loss of lumbar ribs in this lineage?

Correct AnswerAnswered by ExamLex AIThe loss of lumbar ribs in cynodonts may...View AnswerShow Answer

The only therapsid group which survived to enter the Mesozoic was the

Correct AnswerverifiedShow Answer

Discuss the significance of the evolution of echolocation in bats.Could that partially explain why bats are the most diverse group of mammals today?

Correct AnswerAnswered by ExamLex AIThe evolution of echolocation in bats ha...View AnswerShow Answer

Hair is produced by the ___________ layer of the skin.or

Correct AnswerverifiedShow Answer

The North American mammal that shows 10-year cycles in population density,and that is preyed upon by lynx and other predators,is the ______ ______.

Correct AnswerverifiedShow Answer

The adaptive diversification of early mammals was due to

Correct AnswerverifiedShow Answer

The specialized hairs on the nose that are tactile in function (used to "measure" width of passageways,etc. ) are

Correct AnswerverifiedShow Answer

Give evidence that suggests that a chorioallantoic placenta was present in the common ancestor of marsupials and placental mammals,but later was lost in most marsupials.

Correct AnswerAnswered by ExamLex AIOne piece of evidence that suggests a ch...View AnswerShow Answer

Hair is produced by the layer of skin called the __________.

Correct AnswerverifiedShow Answer

White fur of winter animals is due to

Correct AnswerverifiedShow Answer

During their annual growth,antlers develop beneath a covering of highly vascular skin called ___________.

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
Answered by ExamLex AI
The loss of lumbar ribs in cynodonts may...
View Answer

Correct Answer
verified

Correct Answer
Answered by ExamLex AI
The evolution of echolocation in bats ha...
View Answer

Correct Answer
verified

The North American mammal that shows 10-year cycles in population density,and that is preyed upon by lynx and other predators,is the .

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
Answered by ExamLex AI
One piece of evidence that suggests a ch...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified