Multiple choice

The basic structural and functional unit of living organism is _________.

  1. tissue

  2. organ

  3. cell

  4. organ system
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The cell is the fundamental unit of life - all living organisms are composed of cells, and cells carry out all life processes. This is a core principle of cell theory. Tissues (A) are groups of cells, organs (B) are groups of tissues, and organ systems (D) are groups of organs - all are built FROM cells, not the basic unit themselves.

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