A famer stops cultivating mowing a large tract of farmland and abandons it. The natural changes taking place soon afterwards, such as growth of wild grasses and weeds, can be considered secondary succession and not primary succession, because A. lichens are the pioneer species.
B. there is already soil present.
C. the land is not controlled by humans. D. wild grasses and weeds make soil from rocks​

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explanation:

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organ system-an organ system is a group of organs that work together to perform one or more functions. each does a particular job in the body, and is made up of certain tissues.

enzyme active site and substrate specificity

enzymes bind with chemical reactants called substrates. there may be one or more substrates for each type of enzyme, depending on the particular chemical reaction. in some reactions, a single-reactant substrate is broken down into multiple products

the contamination

we are putting to many trash.