Meaning: Nourishment refers to the food or substances necessary for growth, health, and good condition.

Wrong options:

• complain: 'Complain' is a verb that does not fit in this context as it does not relate to food or sustenance.
• complex: 'Complex' is an adjective that describes something intricate, which does not fit as it does not relate to food or nourishment.
• proportionate: 'Proportionate' is an adjective that indicates a balanced relationship, which does not fit as it does not relate to food or nourishment.
• condition: 'Condition' is a noun that refers to the state of something, which does not fit as it does not relate to food or nourishment.
• rewarded: 'Rewarded' is a verb that indicates receiving something in return, which does not fit as it does not relate to food or nourishment.
• stable: 'Stable' is an adjective that describes something steady or unchanging, which does not fit as it does not relate to food or nourishment.

Correct answer: complex

Explanation: The term 'complex' is used as an adjective to describe the food chain, indicating that it consists of multiple interconnected elements. This fits grammatically and contextually as it describes the intricate relationships within the food chain.

Meaning: Complex refers to something that is made up of many interconnected parts, indicating a sophisticated structure.

Wrong options:

• complain: 'Complain' is a verb that does not fit as it does not describe the nature of the food chain.
• nourishment: 'Nourishment' is a noun that refers to food, which does not fit as it does not describe the food chain itself.
• proportionate: 'Proportionate' is an adjective that indicates a balanced relationship, which does not fit as it does not describe the food chain.
• condition: 'Condition' is a noun that refers to the state of something, which does not fit as it does not describe the food chain.
• rewarded: 'Rewarded' is a verb that indicates receiving something in return, which does not fit as it does not describe the food chain.
• stable: 'Stable' is an adjective that describes something steady or unchanging, which does not fit as it does not describe the food chain.

Correct answer: rewarded

Explanation: The word 'rewarded' is a verb that fits grammatically as it indicates the action of receiving a catch as a result of fishing. It aligns contextually with the idea of success in fishing activities.

Meaning: Rewarded means to receive something in return for an action, in this case, a catch for fishing.

Wrong options:

• complain: 'Complain' is a verb that indicates expressing dissatisfaction, which does not fit as it does not relate to the outcome of fishing.
• complex: 'Complex' is an adjective that does not fit as it does not describe the outcome of fishing.
• nourishment: 'Nourishment' is a noun that refers to food, which does not fit as it does not relate to the action of fishing.
• condition: 'Condition' is a noun that refers to the state of something, which does not fit as it does not relate to the outcome of fishing.
• proportionate: 'Proportionate' is an adjective that indicates a balanced relationship, which does not fit as it does not relate to the outcome of fishing.
• stable: 'Stable' is an adjective that describes something steady or unchanging, which does not fit as it does not relate to the outcome of fishing.

Correct answer: condition

Explanation: The term 'condition' is a noun that fits grammatically as it refers to a requirement for the water to support life. It aligns contextually with the necessity of certain factors for sustaining life in water.

Meaning: Condition refers to a state or requirement that must be met for something to occur, in this case, the quality of water needed for life.

Wrong options:

• complain: 'Complain' is a verb that does not fit as it does not relate to the requirements for life in water.
• complex: 'Complex' is an adjective that does not fit as it does not describe a requirement or state.
• nourishment: 'Nourishment' is a noun that refers to food, which does not fit as it does not relate to the requirements for life in water.
• proportionate: 'Proportionate' is an adjective that indicates a balanced relationship, which does not fit as it does not relate to the requirements for life in water.
• rewarded: 'Rewarded' is a verb that indicates receiving something in return, which does not fit as it does not relate to the requirements for life in water.
• stable: 'Stable' is an adjective that describes something steady or unchanging, which does not fit as it does not relate to the requirements for life in water.

Correct answer: proportion

Explanation: The word 'proportion' is a noun that fits grammatically as it refers to the amount of oxygen needed in the water. It aligns contextually with the idea of balance necessary for sustaining life.

Meaning: Proportion refers to the relationship in quantity or degree between two or more things, in this case, the amount of oxygen in the water.

Wrong options:

• complain: 'Complain' is a verb that does not fit as it does not relate to the quantity of oxygen needed.
• complex: 'Complex' is an adjective that does not fit as it does not describe a quantity or relationship.
• nourishment: 'Nourishment' is a noun that refers to food, which does not fit as it does not relate to the quantity of oxygen needed.
• condition: 'Condition' is a noun that refers to a state or requirement, which does not fit as it does not specifically relate to the quantity of oxygen.
• rewarded: 'Rewarded' is a verb that indicates receiving something in return, which does not fit as it does not relate to the quantity of oxygen needed.
• stable: 'Stable' is an adjective that describes something steady or unchanging, which does not fit as it does not relate to the quantity of oxygen needed.