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:

Contract Negotiation

The process of discussing and coming to mutual agreements on the terms and conditions of a contract between two or more parties.

Parietal Cells

Cells located in the lining of the stomach wall that secrete gastric acid (HCl) and intrinsic factor, vital for digestion and absorption of nutrients, respectively.

Pepsinogen

The inactive enzyme precursor of pepsin, secreted by the stomach wall and converted to the active enzyme in the presence of hydrochloric acid.

Omega-3 Fatty Acids

Essential fatty acids found in salmon and other fatty fishes, walnuts, and certain vegetable oils (e.g., canola, soybean); studies suggest that omega-3 fatty acids help lower triglycerides and blood pressure, and have other health benefits.