Ionized ammonia applied to soil is effectively retained because clays in the soil have a charge that is ________.

A. uncharged
B. negative
C. positive
D. None of these are correct. 


Answer: B

Biology & Microbiology

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There is a network of blood vessels covering the surface of the retina through which light must pass to

reach the rods and cones of the eye.

Indicate whether the statement is true or false.

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Which molecule is translated into an amino acid sequence?

A. Transfer RNA B. Primer RNA C. Ribosomal RNA D. Messenger RNA E. Ribozymes

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The Montreal Protocol banned use of _____ , which contribute(s) to ozone depletion

a. DDT b. CFCs c. fossil fuels d. sulfur dioxides

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