The fact that humans usually cannot contract a monkey pneumonia is explained by the theory of _____.

A) mechanical barriers
B) enzyme action
C) interferon
D) species resistance


Ans: D) species resistance
Species resistance occurs when an agent will not cause infection in an animal which is not genetically similar to another animal who has the infection.

Anatomy & Physiology

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Neglecting the effect of air resistance, which of the following is/are true regarding the horizontal component of projectile velocity?

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Which type of bone tissue is considered dense bone?

A. Spongy bone B. Compact bone C. Both "spongy bone" and "compact bone" are correct.

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Which cell has a very small, darkly staining nucleus?

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