Part 1: Choose Your Investigation

Research the relationship between one microorganism, one abiotic factor and one life process. Use reliable sources, including your class resources.

Part 2: Research and Record Evidence

For example, bacteria may break down sugars, proteins and fats. Fungi may decompose cellulose and lignin in leaves or wood.

Remember that air includes oxygen availability. Warm, moist compost with sufficient oxygen often supports active aerobic decomposers.

You could investigate energy release through respiration, obtaining nutrients, or conversion such as nitrifying bacteria changing ammonia into nitrate.

Part 3: Build Your Explanation

Use this cause-and-effect chain: change in abiotic factor → effect on microorganism → change in life process → effect on the environment.

Consider decomposition, heat production, nutrient release, water quality, or the availability of plant nutrients.