👉 Tardigrad, also known as a "tardy" or "slow-grinder," is a type of marine bacteria that lives in water bodies such as warm and stagnant freshwater lakes. Unlike other types of bacteria, tardigrades do not undergo aerobic metabolism but rather rely on anaerobic processes for energy production. The earliest tardigrad species are known to be able to survive without oxygen by using the carbon dioxide produced during photosynthesis. These organisms have been found in water bodies like the