Our Origins: Discovering Physical Anthropology (Fourth Edition)
4th Edition
ISBN: 9780393614008
Author: Clark Spencer Larsen
Publisher: W. W. Norton & Company
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Chapter 11, Problem 4SQ
Summary Introduction
Introduction: The genus Homo comprises modern humans as well as their close relatives. The hominin Homo erectus appeared around 1.8 million years ago. The hominin Homo erectus had several anatomical characteristics similar to the humans at present.
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You want to distinguish between two hypotheses to explain the patterns you see:
1) Males not feeding the young is an adaptation to dimorphism
2) If males don't feed the young in a species, it will allow them to become brightly colored
To begin to address this question, map the characters changes in dimorphism and males feeding
the young onto each of the trees on the previous page.
CHARACTER
SEXUAL DIMORPHISM
MALES FEED YOUNG
Cassin's Vireo
No
No
Red Fox Sparrow
Cape May Warbler
Cedar Waxwing
Golden-Crowned Kinglet
Pyrrhuloxia
Yes
No
No
No
No
Yes
No
Yes
Yes
No
California Gull
No
Yes
Note: This data is fictional
5) Which of the hypotheses in part 4 is consistent with your analysis? Explain why in a brief paragraph.
How was stress helpful for us in our evolutionary past?
A.
None of these are correct.
B.
It helped us to be independent and live alone.
C.
It gave us fight or flight instincts and helped us avoid danger.
D.
Stress is never useful and it only harmed our early ancestors.
How was stress helpful for us in our evolutionary past?
A. It gave us fight or flight instincts and helped us avoid danger.
B. It helped us to be independent and live alone.
C. Stress is never useful and it only harmed our early ancestors.
D. None of these are correct.
Chapter 11 Solutions
Our Origins: Discovering Physical Anthropology (Fourth Edition)
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- Changes in the structure of plants over time, that allow for them to live well in dry habitats, are examples of A. Adaptations B. Instincts C.Resistancearrow_forwardThink about a variety (3+) of adaptations that are beneficial for a Bengal tiger Explain how these developed?arrow_forwardWith______ , the consequences of a voluntary behavior cause an animal to repeat or avoid that behavior. a. instinct c. classical conditioning b. imprinting d. operant conditioningarrow_forward
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