Life: The Science of Biology
11th Edition
ISBN: 9781319010164
Author: David E. Sadava, David M. Hillis, H. Craig Heller, Sally D. Hacker
Publisher: W. H. Freeman
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Chapter 32, Problem 3Q
Summary Introduction
To review:
The reasons why squamates are a better group for the study of the selective forces responsible for the evolution of viviparity compared to mammals.
Given:
The evolution of viviparity in different lineages of the lizard Sceloporus living in different temperature ranges is shown in the figure of the phylogenetic tree given below:
Introduction:
In mammals, viviparity evolved only once in the extant lineages about 100 million years ago. In the squamate reptiles, viviparity is believed to have evolved separately more than 100 times. A phylogenetic tree was constructed to study the evolution of a viviparous mode of reproduction from an oviparous mode, under different temperature ranges for the lizard Sceloporus.
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Which of the following feature is exclusively present in members of class Mammalia?
1.Pulmonary respiration
2.Oviparity
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Temnospondyl fossils show evidence of a lateral line system in the juveniles, but not in the adults. This suggests that ____.
the juveniles relied on filter feeding while the adults did not
the juveniles were aquatic whereas the adults were terrestrial
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the juveniles were terrestrial whereas the adults were aquatic
Chapter 32 Solutions
Life: The Science of Biology
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From Sea to Changing Sea | Early Life in the Oceans || Radcliffe Institute; Author: Harvard University;https://www.youtube.com/watch?v=Ac0TmDf5Feo;License: Standard youtube license