For evaporation of sweat to be an effective cooling mechanism:
A) the relative humidity must be greater than 90%.
B) the environmental temperature must be at least 95°F.
C) ambient air must be relatively unsaturated with water.
D) ambient air must be saturated with a great deal of water.
Answer: C) ambient air must be relatively unsaturated with water.
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The central goal of the U.S. Clean Water Act was to
A. categorize water into types of use and then establish an array of different cleanup goals. B. end all water pollution in the U.S. by 2050. C. make all surface waters swimmable and fishable. D. eliminate all nonpoint source pollution where economically feasible.
Which of the following is not a reason for the origins of agriculture?
A) population growth B) shortages of wild food C) newly evolved plant adaptations D) improved quality of human life E) climate change
Alcohol and pickling solutions were probably widely developed because they
A. Have more interesting flavors than other solutions for seasoning B. Are effective insecticides in the home C. Preserve food due to their pesticidal properties D. Neutralize toxins in foods E. All of these are good reasons why alcohol and pickling solutions were used
____________ dating is a method of dating a sample by comparing its position to the positions of other samples. Fill in the blank(s) with the appropriate word(s)