Species of Oak Trees Periodically Have Years of Large Acorn

question 48

Multiple Choice

Species of oak trees periodically have years of large acorn production, followed by years of lower acorn amounts. In years of plenty, squirrel populations will experience an increase due to increased availability of acorns. Then squirrel populations will decrease after lower acorn abundance. This is an example of

• A) a population cycle.
• B) NPP.
• C) a renewable resource.
• D) a density-independent factor.

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Definitions:

Carbon Dioxide

A colorless, odorless gas produced by burning carbon-containing materials and by respiration. It is absorbed by plants in photosynthesis.

Purkinje Fibers

Cardiac fibers located in the lateral walls of the ventricles.

Myocardium

The muscular tissue of the heart that contracts to pump blood out of the heart and then relaxes as the heart refills with returning blood.

Endocardium

The innermost layer of the heart's walls, lining the chambers and heart valves.