Question

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chemical substance required by an organism for growth, reproduction and maintenance
when one species kills another for food
change or conversion of nutrients from one form to another through biological and chemical processes
linear representation which shows the flow of energy from one organism to another

nutrient cycling # predation # food chain # nutrient

Explanation:

1. A nutrient is a chemical substance required by an organism for growth, reproduction and maintenance.
2. Predation is when one species kills another for food.
3. Nutrient cycling is the change or conversion of nutrients from one form to another through biological and chemical processes.
4. A food - chain is a linear representation which shows the flow of energy from one organism to another.

Answer:

1. Nutrient
2. Predation
3. Nutrient Cycling
4. Food Chain