Which term describes a mechanism that breaks down organic matter and returns nutrients to the environment?

Which term describes a mechanism that breaks down organic matter and returns nutrients to the environment?

• A. Predator
• B. Producer
• C. System
• D. Decomposer

Answer: (D)

Decomposition is the process by which dead material and waste are broken down by decomposers such as bacteria, fungi, and detritivores. These organisms digest the complex organic molecules in leaves, dead animals, and other matter and release nutrients like nitrogen, phosphorus, and minerals back into the soil and water. This recycling of nutrients keeps ecosystems functioning because plants can absorb those nutrients again to grow, sustaining the food web. A predator, by contrast, hunts and eats living prey, which influences population sizes and energy flow but doesn’t primarily recycle nutrients. A producer is an organism, like a plant, that makes organic matter from inorganic sources using light or chemical energy, kick-starting energy flow but not breaking down waste. A system is a general term for a set of interacting parts and doesn’t specify the nutrient-recycling role. The decomposer is the component that completes the cycle by breaking down material and returning nutrients to the environment.

Decomposition is the process by which dead material and waste are broken down by decomposers such as bacteria, fungi, and detritivores. These organisms digest the complex organic molecules in leaves, dead animals, and other matter and release nutrients like nitrogen, phosphorus, and minerals back into the soil and water. This recycling of nutrients keeps ecosystems functioning because plants can absorb those nutrients again to grow, sustaining the food web.

A predator, by contrast, hunts and eats living prey, which influences population sizes and energy flow but doesn’t primarily recycle nutrients. A producer is an organism, like a plant, that makes organic matter from inorganic sources using light or chemical energy, kick-starting energy flow but not breaking down waste. A system is a general term for a set of interacting parts and doesn’t specify the nutrient-recycling role. The decomposer is the component that completes the cycle by breaking down material and returning nutrients to the environment.