Over the Last 100 Years,the Number of Elk in Yellowstone

question 79

Multiple Choice

Over the last 100 years,the number of elk in Yellowstone has varied in part because of the limited availability of winter food sources and many types of predators,including wolves (eliminated in 1926 and reintroduced in 1995) ,grizzly bears,coyotes,black bears,and golden eagles.
-The population of elk in Yellowstone

• A)reflects top-down and bottom-up population regulation.
• B)has survived because of the elimination of a keystone species.
• C)would have been more stable if there had only been one predator species.
• D)would be better off if all predators were eliminated from the park.

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Definitions:

Predators

Organisms that hunt and kill other organisms for food.

Rodents

Mammals of the order Rodentia, characterized by a single pair of continuously growing incisors in each of the upper and lower jaws.

Medical Harm

Adverse effects or complications that occur as a result of medical treatment or intervention, ranging from minor to severe, and can include medication errors, surgical mistakes, and misdiagnoses.

Sleep

A natural, reversible, periodic state of rest for the mind and body, in which consciousness is altered and sensory activity is reduced.