Your friend has trouble distinguishing the color red from the color green. You explain that he is color-deficient because his eyes
A) have larger blind spots than normal.
B) are too elongated or have a cornea that is too round.
C) were damaged by bright sunlight.
D) do not have the photopigments stimulated by red or green light.
E) have rods but no cones.
D
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The reactants of photosynthesis are
A. oxygen and water. B. sunlight and carbon dioxide. C. water and carbon dioxide. D. water and glucose. E. sunlight and chlorophyll.
In order to construct an evolutionary classification of modern-day aquatic vertebrates, what is the best source of information?
A) the DNA sequence B) the structure of organs C) the position of appendages D) the distribution of scales
Sonar is based on the use of radio waves to penetrate water and thus probe the depths of the oceans.
a. true b. false
Which statement is not true about leishmaniasis?
A) It is a slow infection that can persist for months to years. B) It is preventable by a vaccine which is recommended for travelers to endemic areas. C) Over twenty different Leishmania species may cause leishmaniasis. D) It is transmitted by sand flies. E) It is most prevalent in the tropics and subtropics.