♻️ap environmental science review

Bacteria

Written by the Fiveable Content Team • Last updated September 2025
Verified for the 2026 exam
Verified for the 2026 examWritten by the Fiveable Content Team • Last updated September 2025

Definition

Bacteria are single-celled microorganisms that can be found in various environments, including soil, water, and living organisms. While some bacteria are harmless or beneficial, others can cause infections and diseases.