Coitus interruptus, also known as the withdrawal. method, is the oldest form of male contraceptive. method to be practiced.[1] It involves the male partner. pulling out the penis before ejaculation.[1] Even though. it is the oldest method of male contraception to be. practiced, research has given it very little attention.
Updated September 18, 2016. Fermentation is an energy-yielding anaerobic metabolic process in which organisms convert nutrients (typically carbohydrates) to alcohols and acids (lactic acid and acetic acid). Fermentation is perhaps the most ancient biotechnological discovery.
1 Green biotechnology is biotechnology applied to agricultural processes. 2  An example would be the selection and domestication of plants via micropropagation. 3  Another example is the designing of transgenic plants to grow under specific environments in the presence (or absence) of chemicals.