Mutagens are useful in biotechnology research for producing organisms with altered phenotypes. producing new organisms which have beneficial traits from two or more organisms. selecting genetic mutants resistant to radioactivity. removing undesirable traits from microbes. producing DNA fragments for cloning.

The correct answer is A.

Explanation:

A mutagen changes the level of mutations that occur in the DNA either by affecting it physically or chemically. This helps researchers create different organisms with altered phenotypes according to what the research needs so that the genes can be investigated further under a controlled environment.

So the answer is A.

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desert perennials often survive by remaining dormant during dry periods of the year, then springing to life when water becomes available. most annual desert plants germinate only after heavy seasonal rain, then complete their reproductive cycle very quickly.