Multiple choice

What two things to you need for a successful environment? 

  1. plants & animals

  2. humans & air molecules

  3. carbon dioxide & oxygen particles

  4. biotic & abiotic components

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

A successful or functional environment requires both living (biotic) and non-living (abiotic) components to sustain life and nutrient cycles.