Which of the following act as "filters" in the lymph system?
a. macrophages
b. lymph nodes
c. complements
d. immunoglobulins
e. perforins
B
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An example of an organism's genotypic characteristic is its:
a. macroscopic morphologic structure. b. microscopic morphologic structure. c. nucleic acid composition. d. antigenic properties.
The streamlined shape of the dolphin, seal, and other swimming animals is most important for
A. overcoming the forces of gravity acting on the animal. B. reducing the mass of the animal's body. C. maintaining a consistent speed in the dense medium. D. reducing drag from the water they must swim through.
When light rays converge behind the retina, it is known as ____
a. astigmatism b. color blindness c. nearsightedness d. macular degeneration
e. farsightednessAlthough water is considered a renewable resource, what is a reason why it might be more like a nonrenewable resource?
a. water resources are not evenly distributed around the world b. water can be used up faster than it can be returned in the water cycle c. water can be polluted, depleting the supply of fresh water d. b and c e. all of the above