What is the oldest form of biotechnology? selective breeding hybridization cloning recombinant dna

The correct answer is selective breeding.

The selective breeding is a technique, in which the animals or plants of a desired trait is selected an bred, in order to obtain the desired trait in the progeny.

The technique of selective breeding is very ancient, even it was used by Mendel in his pea plant experiment. With the advancement in the techniques of biotechnology, hybridization, cloning, and recombinant DNA technology was developed.

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for  example, forests have higher evapotranspiration than other ecosystems,  such  as grasslands, because of their deeper roots and greater leaf area. thus forests have a net moistening effect on the atmosphere and become a moisture source for downwind ecosystems.