Earthworms excrete ________
A) mucus
B) casts
C) humus
D) litter
E) perspiration
Answer: B
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Which of the following is likely to happen if the CO2 level in the atmosphere exceeds 650 ppm?
A. 70% of all land-based species could go extinct. B. Fire ant populations would crash. C. Lodgepole pine populations would explode. D. Only specialized plants and animals would survive.
Mountain streams running from a tributary valley to a main valley that has been glaciated frequently create ________.
A) end moraines B) till C) waterfalls D) cirques E) kames
What two elements are directly related to the energy level a given shore experiences?
a) the height of tides and the annual rainfall of the region b) the frequency of red tides and the particle size of the beach's sediment c) the latitude of the beach and the frequency of rip tides d) the strength of waves and longshore currents
Temperate grasslands are
A. characterized by very rich soils. B. generally a mixture of grasses and forbs. C. characterized by very rich soils and often converted to farmland. D. characterized by very rich soils, often converted to farmland, and generally a mixture of grasses and forbs. E. often converted to farmland.