Multiple choice

The basic unit that makes up living things is called the ____.

  1. organ

  2. nucleus

  3. chloroplast

  4. cell
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The cell is the basic structural, functional, and biological unit of all known living organisms. According to cell theory, all living things are composed of one or more cells. Organs and nuclei are structures within or made of cells, rather than the fundamental unit of life itself.

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