The oceans contain about ________% of the Earth's water.

A. 95
B. 93
C. 91
D. 97


Answer: D

Biology & Microbiology

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Which of these is a correct statement about pH?

A) The pH of a solution increases as its acidity increases. B) The pH of a basic or alkaline solution is less than that of an acidic solution. C) As the concentration of H+ increases in a solution, the pH decreases. D) A solution to which HCl has been added will have a greater pH than a solution to which NaOH has been added. E) Each number on the pH scale represents an increase of 108.

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Which molecule is believed to have preceded the other two during the evolution of life?

A. DNA B. RNA C. Proteins

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The standing crop biomass is the ____

a. amount of sunlight absorbed by the plants b. amount of water accumulated per acre of crop plants c. total dry weight of plants at a given time d. number of plant species present e. productivity of the plants

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This figure depicts which of the following?

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