Which body feature in birds is a necessity to allow powerful flight muscles to operate?
a. a beak
b. hollow, light-weight bones
c. a cloaca
d. an enlarged sternum with a protruding keel to bones of the upper limb.
e. keen eyesight
d
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Which of the following ocular tissues and infections is mismatched?
A. Keratitis; infection of deep eye tissue B. Conjunctivitis; milky discharge and infection of eyelid lining C. River blindness; microfilariae visible in the vitreous chamber D. Trachoma; infection of epithelial cells
Which of the following lymphocytes secretes large quantities of antibodies?
A) B cells B) T cells C) Natural killer cells D) All of the above
Which of the following statements does not describe a way in which fungi differ from plants?
A. Fungi have nuclear mitosis. B. Fungi have cell walls made of cellulose. C. Fungi have filamentous bodies. D. Fungi have nonmotile sperm. E. Fungi are heterotrophic.
If after several generations 30 percent of the males have antlers with 9 to 11 points, 40 percent have antlers with 15 to 17 points, and 20 percent have antlers with 12 to 14 points, this development will have been the result of:
A) directional selection. B) disruptive selection. C) stabilizing selection. D) founder effect.