The final treatment of sewage before release into the environment is ________.

A. skimming
B. aeration
C. filtration
D. sludge digesting
E. chlorination


Answer: E

Biology & Microbiology

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Enzymes speed up reactions by

A. raising activation energy. B. producing heat. C. reducing entropy. D. lowering activation energy. E. raising activation energy AND reducing entropy.

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Kevin traveled to Africa, and upon his return, he was diagnosed with malaria. What type of

pathogen causes malaria?

a. protist b. virus c. bacterium d. fungi

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The total amount of water in the hydrologic cycle has been decreasing over the last million years.

Answer the following statement true (T) or false (F)

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Most of the water vapor in the earth's

atmosphere comes from evaporation from a. lakes. b. rivers. c. land. d. oceans. e. plants.

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