Density-independent factors which play a role in regulating population size in nature include
A. natural disasters.
B. geographical barriers.
C. weather.
D. All of the choices are correct.
Answer: D
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Table 3.6 in your textbook uses Paramecium to illustrate several types of light microscopy. Each image is magnified 230X and measures about 4 cm. The actual size of a Paramecium is about ________.
A. 0.2 ?m B. 4,000 ?m C. 57.5 ?m D. 175 ?m E. 920 ?m
What event occurs in a deciduous forest at the beginning of the dry season? a. Trees drop their leaves
b. Pollination by bees. c. Growth spurt by the trees. d. Trees store large amounts of water. e. Trees add additional growth to their trunks.
Barnacles are
a. parasites. b. herbivores. c. predators. d. filter feeders. e. all of these.
There are two major groups of nervous system drugs. Drugs in one group retard heartbeat, promote digestion, contract the eye pupil, etc. The other drugs have the opposite effect. These drugs are affecting the
A. cerebrum and cerebellum, respectively. B. central and peripheral nervous systems. C. sympathetic and parasympathetic nervous systems. D. motor and sensory nerves. E. neurostimulatory and neuroinhibitory synapses.