Match the Column I with Column II :

A-4,B-3,C-1,D-2

Column I         Column II

A. Natural ecosystem 3. Forest

B. Decomposer         4. Bacteria

C. Primary productivity 1. Producer

D. Secondary productivity 2. Consumer

Explanation:

A. Natural ecosystem refers to a specific habitat or environment where living organisms interact with each other and their surroundings.

B. Decomposer refers to organisms, such as bacteria and fungi, that break down dead organic matter into simpler substances.

C. Primary productivity is the rate at which producers (usually plants) convert sunlight into organic matter through photosynthesis.

D. Secondary productivity refers to the rate at which consumers (animals) convert the organic matter obtained from producers into their own biomass.