Multiple choice

Which is level of organization is the HIGHEST?

  1. tissue

  2. an organ

  3. an organism

  4. an organ system

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The organism is the highest level of biological organization, comprising all lower levels (cells, tissues, organs, organ systems). Organ systems work together within an organism. The progression from lowest to highest is cell - tissue - organ - organ system - organism.