Biology: The Dynamic Science (MindTap Course List)
Biology: The Dynamic Science (MindTap Course List)
4th Edition
ISBN: 9781305389892
Author: Peter J. Russell, Paul E. Hertz, Beverly McMillan
Publisher: Cengage Learning
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Chapter 53, Problem 5TYK

A keystone species:

a. is usually a primary producer.

b. has a critically important role in determining the species composition of its community.

c. is always a predator.

d. usually reduces the species diversity in a community.

e. usually exhibits aposematic coloration.

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Akeystone species is one:a.that makes up a very large proportion of total community biomass.b.that feeds on a very large fraction of all available prey species.c.that is fed on by a very large fraction of all predators in itscommunity.d. whose feeding activities have adisproportionate effect on the structure of its community.e.that occupies the lowest level (the base) of the food web.
Which of the following defines the role of a species in a community,including its habitat and interaction with other species?a. ecological niche                          d. mimicryb. competitive exclusion                 e. None of these are correct.c. competition level
At any point in time, a number of environmental objectives must be met with a limited amount of economic resources. This means that once an environmental problem is identified, they have to be prioritized. In general, this is done using scientific valuation of the relative risk to human health and the ecology of a given environmental hazard - a procedure known as: A. Biodiversity B. Public Goods C. Risk Assessment D. Profit maximization
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