Organisms (e.g., Escherichia coli)

Organisms are living entities that can carry out life processes such as growth, reproduction, and response to their environment. Escherichia coli (E. coli) is a common type of bacteria found naturally in the intestines of humans and animals, where it helps with digestion. While many strains are harmless, some can cause illness. Bacteria like E. coli are microscopic, meaning they are too small to see without a microscope, and they are a fundamental part of many ecosystems, playing roles in health, the environment, and industry.