k Birds Crocodiles Lizards Turtles Mammals W N

Health Safety And Nutrition F/Young Child
9th Edition
ISBN:9781305144767
Author:MAROTZ
Publisher:MAROTZ
Chapter9: Management Of Injuries And Acute Illness
Section: Chapter Questions
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Birds and mammals are both endothermic, i.e. they maintain their body temperature internally through their metabolism rather then by matching environment. How do you explain this, given the position of these two groups on this phylogenetic tree?
 


According to this phylogenetic tree, turtles must also be endotherms

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.

k
Birds Crocodiles
Lizards
Turtles
Mammals
W
N
Transcribed Image Text:k Birds Crocodiles Lizards Turtles Mammals W N
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