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Many birds that form flocks compete through
aggressive interaction for priority of access to
resources such as food and shelter. The result of
repeated interactions between flock members is that
(5) each bird gains a particular social status related to its
fighting ability, with priority of access to resources
increasing with higher status. As the number and
intensity of interactions between birds increase,
however, so increase the costs to each bird in terms of
(10) energy expenditure, time, and risk of injury. Thus,
birds possessing attributes that reduce the number of
costly interactions in which they must be involved,
without leading to a reduction in status, are at an
advantage. An external signal, such as a plumage type,
(15) announcing fighting ability and thereby obviating the
actual need to fight, could be one such attribute.
The zoologist Rohwer asserted that plumage
variations in “Harris sparrowsâ€
Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
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Looks like I would have made more mistakes than I should!
Total Time: 13 min
Time to read: 3 min
first, second and third questions: 2 min each (rest I didn't record)
Answers:
1 B
2 A
3 B
4 B
5 E
6 D
7 A
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