Bacteria are described as

• A. Very small, single celled organisms found almost everywhere
• B. Very large multicellular organisms
• C. A type of virus
• D. A chemical that kills cells

Answer: (A)

Bacteria are incredibly small, single-celled organisms found almost everywhere. Each bacterium operates as its own cell, carrying out all the basic life processes within that one unit. They’re also prokaryotes, meaning their cells lack a nucleus. Their presence spans soil, water, air, and the bodies of living things, making them everywhere around us. They are not viruses, which are much smaller and need a host cell to reproduce, nor are they a chemical that kills cells. This combination of being tiny, single-celled organisms found in virtually all environments best fits the description.