Many bird wings are more convex on the upper surface than they are on the lower surface. This enables the wing to provide greater lift because
A. A. air moves more slowly over the top surface of the wing than over the lower surface.
B. B. air moves more quickly over the top surface of the wing than over the lower surface.
C. C. the pressure above the wing is greater than below the wing.
D. D. the pressure above the wing is less than below the wing.
E. A and C
F. B and D
G. A and D
H. B and C
F. B and D
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Which of the following conditions is not known to be a cause of kidney failure?
a. exposure to lead, arsenic, or pesticides b. complications of diabetes c. high blood pressure d. fever from influenza
Which group is made up of almost exclusively decomposers?
a. plants b. fungi c. animals d. bacteria e. protists
A network of interactions that involves the cycling of
materials and the flow of energy among organisms and their physical environment is a. a population. b. a community. c. an ecosystem. d. the biosphere. e. the habitat.
Single-celled organisms called ciliates are
A) fungi. B) protozoa. C) insects. D) algae. E) water molds.