Lichens are used by scientists as an indicator of pollution because they
a. require nonpolluted water to grow.
b. are extremely sensitive to sulfur dioxide.
c. react to small amounts of carbon monoxide.
d. are very sensitive to ultraviolet radiation.
e. respond to increased levels of chlorofluorocarbons.
B
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The vestibular apparatus
a. controls balance. b. consists of three fluid filled semi-circular canals. c. contains mechanoreceptors that detect fluid shifts. d. includes all of these. e. includes b and c only
Thomas Malthus proposed that
a. the food supply increased faster than the population. b. the population increased faster than the food supply. c. the food supply and population increased at the same rate. d. artificial selection was the key to evolution. e. natural selection was the key to evolution
What is the role of the green pigment chlorophyll in photosynthesis?
What will be an ideal response?
You hang a microscope slide from a submerged, L-shaped PVC pipe in lake water that is 2 feet deep. The slide hangs 6 inches below the surface of the water and remains there for eight weeks. When you remove it and bring it to your lab for observation, you
see that algae, bacteria, and even some fungi have colonized the slide. You determine that you are looking at a(n) A) biofilm. B) community of eukaryotes. C) biological weapon. D) endotoxin.