B irds and mammals are both endothermic. i.e. They maintain body temperature int
ID: 68440 • Letter: B
Question
B
irds and mammals are both endothermic. i.e. They maintain body temperature internally through metabolism rather than from the environment. How would you explain this, given the position of the two groups of animals on the phylogenetic tree?
This is false, birds are ectotherms.
Endothermy is a synapomorphy for birds and mammals, so the tree must be wrong.
Endothermy evolved independently in mammals, and again in birds, making it "convergent."
Birds and mammals must be endothermic, so that they can keep their developing offspring warm.
Based on the tree shown, which is an accurate statement of the relationship among organisms?
A lizared is more closely related to a turtle than to a crocodile.
A lizard is more closely related to a crocodile that to a turtle.
A lizard is equally related to a crocodile and a turtle.
A lizard is related to a turtle, but is not related to a crocodile.
Which of the letters (N, W, C, or P) corresponds to the most recent common ancestor of a lizard and a bird?
N
W
C
P
1.This is false, birds are ectotherms.
2.Endothermy is a synapomorphy for birds and mammals, so the tree must be wrong.
3.Endothermy evolved independently in mammals, and again in birds, making it "convergent."
4.Birds and mammals must be endothermic, so that they can keep their developing offspring warm.
Explanation / Answer
Birds and mammals are both endothermic. i.e. They maintain body temperature internally through metabolism rather than from the environment. How would you explain this, given the position of the two groups of animals on the phylogenetic tree?
The correct option is .................3.Endothermy evolved independently in mammals, and again in birds, making it "convergent."
Mammals and birds evolved independently from reptiles. Endothermy eolved in therapsid reptiles, one of which was ancestral to mammals.Both living birds and mammals have respiratory turbinates which help in the process of endothermy. But birds have evolved from dinosaurs which were exothermic.
Based on the tree shown, which is an accurate statement of the relationship among organisms?
The correct option is ................2. A lizard is more closely related to a crocodile that to a turtle.
Which of the letters (N, W, C, or P) corresponds to the most recent common ancestor of a lizard and a bird?
The correct option is ...............3. C
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