Polychaetes are the most successful worm phyla, being found in terrestrial, aquatic, and marine
environments. Indicate whether the statement is true or false.
ANS: F
Nematodes are considered the most successful phylum of the worms. Most roundworms are free-living
and microscopic. Information can be found in the section The Worm Phyla Are the Link to Advanced
Animals.
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Given sites with the following soil thickness (ST) and % of basic compounds (BC):(1) ST = 1 foot, BC = 11%(2) ST = 2 feet, BC = 75%(3) ST = 3 feet, BC = 50%(4) ST = 4 feet, BC = 11%Which site is most sensitive to acid deposition?
A. Site 1 B. Site 2 C. Site 3 D. Site 4
Acid deposition can affect forests by
a. Leaching out essential plant nutrients b. Diminishing the supply of Oxygen available to the tree c. Releasing ions that are toxic to the trees d. A and B are correct e. A and C are correct
Occasionally, an elongated ominous-looking cloud forms just behind a gust front. This type of cloud, which appears to slowly spin about a horizontal axis, is called a ____
A) downburst B) shelf cloud C) wall cloud D) roll cloud
Since 1980, Arctic sea ice has ____.
A. decreased in volume and surface area B. decreased in volume but not changed in surface area C. increased in volume and surface area D. not changed in volume or surface area E. not changed in volume, but decreased in surface area