Two Species of Closely Related Squirrels Both Feed on Acorns

question 111

Multiple Choice

Two species of closely related squirrels both feed on acorns produced by oak trees.One species feed exclusively near the top of the tree and the other feeds exclusively towards the bottom of the tree.This is an example of

• A) competitive exclusion.
• B) resource partitioning.
• C) mutualism.
• D) commensalism.
• E) mimicry.

---

Definitions:

Absolute Refractory Period

A period immediately following the firing of a nerve fiber when it cannot be stimulated for a brief period, regardless of how strong the incoming stimulus may be.

Relative Refractory Period

A period shortly after the firing of a nerve during which the nerve cannot be stimulated to fire again at its maximum rate, but can still respond to a stronger than usual stimulus.

Firing Rate

The frequency at which a neuron discharges electrical impulses over a certain period of time.

Absolute Refractory Period

The period immediately following an action potential during which a neuron is completely unable to fire another action potential, regardless of the strength of the stimulus.