A Community May Undergo a Regime Shift or a Phase

question 45

Multiple Choice

A community may undergo a regime shift or a phase shift when _______________

• A)it has too many symbiotic relationships among species
• B)it loses keystone species or suffer a major climatic change
• C)pollutants cause a rapid rise in mutations
• D)it suffers a natural fire or flood
• E)all invasive and exotic species are removed

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Definitions:

Glial Cells

Supportive cells in the central nervous system that do not produce electrical impulses but perform functions such as nutrient support, waste cleanup, and myelin formation around neurons.

Histamine

A compound involved in local immune responses, functioning as a neurotransmitter and playing a role in regulating physiological function in the gut and acting as a mediator of itching.

Arousal

A state of heightened physiological and psychological activity, involving the brain, various bodily systems, and behavior.

Asthma

A chronic inflammatory disease of the airways characterized by variable and recurring symptoms, reversible airflow obstruction, and bronchospasm.