Communities Change with Respect to Several Timescales

question 2

Multiple Choice

Communities change with respect to several timescales.An example of long-term change would be the

• A) annual variability in population size.
• B) presence or absence of a migrant species.
• C) species composition of the community.
• D) decline in prey abundance during a harsh winter.

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Definitions:

Light Entering

Refers to the process of light passing into the eye, pivotal for the process of vision.

Pupil

The opening in the center of the iris of the eye, which regulates the amount of light reaching the retina.

Cornea

The clear, dome-shaped front surface of the eye that acts as a window to allow light to enter the eye.

Just Noticeable Change

The minimal difference in stimulation that a person can detect 50% of the time, also known as the difference threshold.