2. Bacteria

Bacteria are diverse, single-celled living organisms that can reproduce. They are found almost everywhere on the planet. While many are harmful and cause a variety of diseases, some bacteria are beneficial, such as those that live in the gut and help with digestion. There are five basic bacterial shapes: comma-shaped, rod-shaped, spherical-shaped, spiral-shaped, and flagellated.

Bacteria Petri dish AndreasReh / Getty Images

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