20)
An organ, in any multicellular organism, would BEST be described as
zoom in
several types of cells working together for a common purpose
B)
a group of the same kind of cells with a common structure and function
9
a structure containing a single cell that is part of a large system.
a structure made of two or more tissues functioning together for a common
purpose
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An organ, in any multi-cellular organism, would BEST be described as

zoom in  several types of cells working together for a common purpose.

a structure made of two or more tissues functioning together for a common  purpose

Explanation:

the answer is b: 1.4 km/hr

affects the water bodies: excessive use of fertilizers causes eutrophication. the fertilizers which are used on plants affect the quality of land on which it is used, further causing erosion of soil. the fertilizers used on plants contain harmful chemical fumes which affect the environment.