What are two specific examples of biotechnology that have been done by humans for thousands of years?

Two specific examples of biotechnology that have been practiced by humans for thousands of years are fermentation and selective breeding. Fermentation has been used to produce Alcoholic Beverages, bread, and dairy products, harnessing microorganisms like yeast and bacteria for food preservation and flavor enhancement. Selective breeding, on the other hand, involves choosing specific plants or animals with desirable traits to reproduce, leading to improved agricultural yields and livestock characteristics over generations.