Food is normally prevented from entering the nasopharynx by the:

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Which statement best describes a keystone species? o a. it has littlelmenetic variation. it has an extremely high population. 0 b. 0 c. it remains unaffected by all environmental changes. od. it has a strong influence on the ecosystem. 0 e. it's the first species to populate a new ecosystem.

Which of the following occurs after a natural or unnatural disturbance in an ecosystem