Which of the following statements best belongs in an environmental assessment of chemical fertilizers? A. Chemical fertilizers help to keep global temperatures low.
B. Chemical fertilizers remove impurities from the groundwater.
C. Chemical fertilizers are harmless when used in dry areas.
D. Chemical fertilizers threaten to pollute the water supply.

Ithink the answer to that would be b):

Amath expression is a collection of one or more terms, which are separated by the signs ( + , - , x , / ).example :   8+b8+b  or  a−3a−3in algebra, an equation is a mathematical statement with two expressions where, each expression is separated by an equal (=) sign. variables can be present on both the sides of the equality (=) sign and we use letters to denote such variables.example 1:   x=4+2x=4+2  , [here, we can observe that the variable is present only on one side of the equation].example 2:   2x+3=x+42x+3=x+4  , [here, we can observe that the variables are present on both side of the equation].

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