Meaning: 'Species' denotes a group of living organisms that share common characteristics and can reproduce.

Wrong options:

• survival: Survival refers to the ability to continue living or existing, which does not fit as it does not describe a group of organisms.
• hence: Hence is an adverb used to indicate a conclusion or result, which does not fit grammatically as a noun in this context.
• procedure: Procedure refers to a series of actions conducted in a certain order, which does not relate to the classification of organisms.
• instance: Instance refers to an example or case of something, which does not fit as it does not describe a group of organisms.
• while: While is a conjunction used to indicate contrast or simultaneous actions, which does not fit as it does not describe a group of organisms.
• distinction: Distinction refers to a difference or contrast between similar things, which does not fit as it does not describe a group of organisms.

Correct answer: hence

Explanation: The word 'hence' serves as a transitional adverb that indicates a conclusion drawn from the previous statement. It fits grammatically as it connects the cause (lack of attraction to artificial light) with the effect (the behavior of butterflies), maintaining logical coherence in the sentence.

Meaning: 'Hence' means as a consequence or for this reason.

Wrong options:

• survival: Survival does not fit grammatically as it is a noun and does not serve as a transitional word in this context.
• species: Species is a noun that does not function as a transitional word and does not connect the ideas in the sentence.
• procedure: Procedure is a noun that refers to a method or process, which does not fit as it does not indicate a conclusion or result.
• instance: Instance is a noun that refers to an example, which does not fit as it does not connect the ideas logically.
• while: While is a conjunction that indicates contrast, which does not fit as it does not convey a conclusion or result.
• distinction: Distinction is a noun that refers to a difference, which does not fit as it does not serve as a transitional word.

Correct answer: distinction

Explanation: The term 'distinction' refers to a difference or contrast between two or more things. It fits grammatically as a noun that serves as the subject of the sentence, and contextually, it aligns with the discussion about the differing behaviors of butterflies and moths.

Meaning: 'Distinction' means a difference or contrast between similar things.

Wrong options:

• survival: Survival refers to the ability to continue living, which does not fit as it does not describe a difference in behavior.
• species: Species refers to a group of organisms, which does not fit as it does not describe a difference in behavior.
• hence: Hence is an adverb that indicates a conclusion, which does not fit as it does not describe a difference.
• procedure: Procedure refers to a method or process, which does not fit as it does not describe a difference in behavior.
• instance: Instance refers to an example, which does not fit as it does not describe a difference in behavior.
• while: While is a conjunction that indicates contrast, which does not fit as it does not describe a difference.

Correct answer: survival

Explanation: The word 'survival' refers to the strategies and adaptations that organisms develop to continue existing in their environments. It fits grammatically as a noun that serves as the object of the sentence, and contextually, it aligns with the discussion about the strategies evolved by butterflies and moths.

Meaning: 'Survival' refers to the act of continuing to live or exist, especially in difficult conditions.

Wrong options:

• species: Species refers to a group of organisms, which does not fit as it does not describe strategies for living.
• hence: Hence is an adverb that indicates a conclusion, which does not fit as it does not describe strategies.
• procedure: Procedure refers to a method or process, which does not fit as it does not describe strategies for survival.
• instance: Instance refers to an example, which does not fit as it does not describe strategies for living.
• while: While is a conjunction that indicates contrast, which does not fit as it does not describe strategies for survival.
• distinction: Distinction refers to a difference, which does not fit as it does not describe strategies for living.