Read the Following Scenario and Answer the Question Below

question 40

Multiple Choice

Read the following scenario and answer the question below.
Many biologists and environmental educators are interested in maintaining biodiversity in urban landscapes, where preserves or reserves are scarce unless land has been set aside for them in urban planning. Nonetheless, they have discovered that making even small changes in commercial and residential landscaping can help promote biodiversity. Some of the changes that have been recommended and been successful include using native species for street trees and for decorative landscaping, reducing pesticide use on lawns and gardens, and reducing fertilizer use through composting and mulching.
Also, managers of schools, larger businesses, and residences are encouraged to increase habitat diversity by creating "landscape islands" that include larger trees surrounded by shrubs and herbaceous plants. Landscape islands ideally should include native species, mixed with exotic ornamentals at the discretion of the land owners.
-The species that are generally most vulnerable to human impact are the _______________

• A)producers
• B)decomposers
• C)competitive species
• D)top predators
• E)keystone species

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Definitions:

Unit Elastic

A situation where the quantity demanded or supplied changes by an exact proportional amount to the price change.

Price Elasticity

A measure of how much the quantity demanded of a good responds to a change in its price, with high elasticity indicating significant response and low elasticity indicating little to no response.

Oranges

A citrus fruit commonly consumed worldwide, both fresh and in juice form, and used as a commodity in agricultural markets.

Cross-Price Elasticity

A measure of how the quantity demanded of one good responds to a change in the price of another good.