Multiple choice

The lowest level of organization is _____.

  1. cellular level

  2. ecosystem

  3. molecular level

  4. population level

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

The biological hierarchy of organization starts at the molecular level (atoms and molecules), then progresses to cellular, tissue, organ, organism, population, community, ecosystem, and biome levels. Molecular is the most fundamental level.