Meaning: 'Ensure' means to make certain that something will occur.

Wrong options:

• controls: 'Controls' is a noun that does not fit grammatically as it does not indicate an action related to the measures.
• broken: 'Broken' is an adjective that does not convey an action and is irrelevant in this context.
• qualified: 'Qualified' is an adjective that does not fit as it does not express an action related to the measures.
• justify: 'Justify' is a verb but does not relate to the action of informing the public, making it contextually inappropriate.
• suffered: 'Suffered' is a verb that indicates experiencing pain or distress, which does not fit the context of ensuring public information.
• possibility: 'Possibility' is a noun that does not convey an action and is not relevant in this context.
• substitutes: 'Substitutes' is a noun that does not fit grammatically as it does not indicate an action related to the measures.

Correct answer: justify

Explanation: The term 'justify' is a verb that fits grammatically and contextually, as it indicates the action scientists must take to explain their use of live animals in research.

Meaning: 'Justify' means to provide reasons or explanations for an action.

Wrong options:

• controls: 'Controls' is a noun that does not fit as it does not indicate an action required from scientists.
• broken: 'Broken' is an adjective that does not relate to the action of explaining or defending the use of animals.
• qualified: 'Qualified' is an adjective that does not express an action and is irrelevant in this context.
• ensure: 'Ensure' is a verb that does not relate to the need for scientists to explain their actions.
• suffered: 'Suffered' is a verb that indicates experiencing pain, which does not fit the context of justifying actions.
• possibility: 'Possibility' is a noun that does not convey an action and is not relevant in this context.
• substitutes: 'Substitutes' is a noun that does not fit grammatically as it does not indicate an action required from scientists.

Correct answer: substitutes

Explanation: The word 'substitutes' is a plural noun that fits grammatically and contextually, as it refers to alternatives that could replace the use of live animals in research.

Meaning: 'Substitutes' refers to things that can replace others.

Wrong options:

• controls: 'Controls' is a noun that does not fit as it does not refer to alternatives in the context of animal research.
• broken: 'Broken' is an adjective that does not relate to the concept of alternatives and is irrelevant here.
• qualified: 'Qualified' is an adjective that does not fit as it does not refer to alternatives in this context.
• justify: 'Justify' is a verb that does not relate to the concept of alternatives and is not appropriate here.
• suffered: 'Suffered' is a verb that indicates experiencing pain, which does not fit the context of alternatives.
• possibility: 'Possibility' is a noun that does not convey the idea of alternatives and is not relevant in this context.
• ensure: 'Ensure' is a verb that does not fit grammatically as it does not refer to alternatives in the context of animal research.

Correct answer: qualified

Explanation: The term 'qualified' is an adjective that fits grammatically and contextually, as it describes members of the council who possess the necessary expertise and credentials.

Meaning: 'Qualified' means having the necessary skills or credentials.

Wrong options:

• controls: 'Controls' is a noun that does not fit as it does not describe the type of members in the council.
• broken: 'Broken' is an adjective that does not relate to the qualifications of council members and is irrelevant here.
• justify: 'Justify' is a verb that does not fit as it does not describe a type of member.
• suffered: 'Suffered' is a verb that indicates experiencing pain, which does not fit the context of describing members.
• possibility: 'Possibility' is a noun that does not convey the idea of qualifications and is not relevant in this context.
• ensure: 'Ensure' is a verb that does not fit grammatically as it does not describe the type of members in the council.
• substitutes: 'Substitutes' is a noun that does not fit as it does not describe the qualifications of council members.

Correct answer: controls

Explanation: The word 'controls' is a plural noun that fits grammatically and contextually, as it refers to regulations or measures in place regarding the treatment of animals.

Meaning: 'Controls' refers to rules or regulations that govern behavior.

Wrong options:

• broken: 'Broken' is an adjective that does not fit as it does not relate to regulations or measures.
• qualified: 'Qualified' is an adjective that does not fit as it does not refer to regulations or measures.
• justify: 'Justify' is a verb that does not relate to the concept of regulations and is not appropriate here.
• suffered: 'Suffered' is a verb that indicates experiencing pain, which does not fit the context of regulations.
• possibility: 'Possibility' is a noun that does not convey the idea of regulations and is not relevant in this context.
• ensure: 'Ensure' is a verb that does not fit grammatically as it does not refer to regulations regarding animal treatment.
• substitutes: 'Substitutes' is a noun that does not fit as it does not refer to regulations or measures.