The opening to the tracheal system (respiratory system) in insects is the

A. spiracle.
B. trachea.
C. bronchus.
D. alveolus.
E. stomata.


Answer: A

Biology & Microbiology

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An autosomal dominant trait

A) passes from mother to son only. B) skips generations. C) can be carried by unaffected individuals. D) can affect either sex.

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When you bring your hand to your shoulder,

your biceps muscle ___ and your triceps muscle ___.

a. contracts---relaxes b. relaxes---contracts c. contracts---contracts d. relaxes---relaxes e. lengthens---shortens

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Nearsightedness is caused by

a. eye structure that focuses an image in front of the retina. b. uneven curvature of the cornea. c. uneven curvature of the lens. d. eye structure that focuses an image posterior to the retina. e. all of these.

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reduction reaction

What will be an ideal response?

Biology & Microbiology