Biology
Biology
12th Edition
ISBN: 9780134813448
Author: Audesirk, Teresa, Gerald, Byers, Bruce E.
Publisher: Pearson,
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Chapter 43.5, Problem 1HYEW
Summary Introduction

To determine:

Why childbirth is so difficult.

Introduction:

Earlier, head of the newborn babies was smaller due to the poor nutrients. But now, the women’s hip has evolved wider so that large headed infants would be easily squeezed out.

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Using vertebrates as an example, how does comparative embryology prove evolution?
Scientists compare the structures of a chicken embryo and a human embryo at the same stage of development. They find that both vertebrates have similar shapes and structures, including the presence of gill slits and tails. How is this comparison of the embryos used as supporting evidence of evolution? A. The similarities suggest that chickens and humans are the direct descendants of modern day fish with tails and gill slits. B. The similarities suggest that vertebrates passthrough each of the adult stages of their evoluntionary history as they develop. C. The similarities suggest that vertebrates can undergo genetic changes during development that lead to the evolution of new species D. The similarities suggest that chickens and humans descend from ancestors with genes that code for the development of tails and gill slits
Can you suggest why, during the evolutionary history of animals, there has been a tendency for maximum body size to increase? Do you think it inevitable that complexity should increase along with body size? Why or why not?
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The Evolution of Populations: Natural Selection, Genetic Drift, and Gene Flow; Author: Professor Dave Explains;https://www.youtube.com/watch?v=SRWXEMlI0_U;License: Standard YouTube License, CC-BY
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