Which of the following choices is not an example of a giant molecule​

Explanation:

A substance containing a large number of atoms which are covalently bonded, is called a giant molecule or a giant covalent lattice. There are four examples of molecules made from non-metals which form giant structures. They are silicon, silicon dioxide and two forms of the element carbon called diamond and graphite polymers are a different kind of large molecule.

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"do a testcross with a homozygous recessive plant."

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.