Speciation caused by a change in the course of a
river is an example of __________ speciation.
a. divergent
b. parapatric
c. allopatric
d. convergent
e. sympatric
Answer: c
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Primary treatment of sewage involves the use of which type of process?
A. Physical/chemical removal of insoluble particulate materials B. Biological removal of inorganic nutrients C. Virus removal/inactivation D. Biological removal of dissolved organic matter
A solution at a pH of 10 contains how many times more hydrogen ions than a solution at a pH of 7?
a. 2 b. 3 c. 10 d. 100 e. 1,000
Plants take in the sun's energy by absorbing.
a) high-energy sugars. b) chlorophyll a. c) chlorophyll b. d) sunlight.
Which of the following statements about the atom 126C is false?
a. It has 6 protons in its nucleus. b. It has 12 neutrons in its nucleus. c. It has 6 electrons orbiting the nucleus. d. Its atomic number is 6. e. Its atomic weight is 12.