A.I. Explanation:

Correct answer: conveying

Explanation: The word 'conveying' is a gerund that functions as a noun in this context, indicating the action of communicating complex messages. It fits grammatically as it follows the preposition 'on' and aligns with the context of octopus communication.

Meaning: 'Conveying' means to communicate or make known, particularly in the context of messages or information.

Wrong options:

• hiding: The word 'hiding' is a gerund that implies concealment, which does not relate to the act of communication and does not fit the context.
• signs: The word 'signs' is a noun that does not fit grammatically in this position, as it does not serve as an action or process of communication.
• turn: The word 'turn' is a noun that refers to a change in direction or position, which does not relate to the act of communication.
• moving: The word 'moving' is a gerund that implies physical motion, which does not fit the context of conveying messages.
• reassuring: The word 'reassuring' is an adjective that describes a comforting action, but it does not fit grammatically as a noun in this context.
• option: The word 'option' is a noun that refers to a choice, which does not relate to the act of communication.

Correct answer: approaching

Explanation: The word 'approaching' is a gerund that indicates the action of coming near, which is appropriate in the context of a younger octopus getting closer to a dominant one. It fits grammatically as it serves as the subject of the clause.

Meaning: 'Approaching' means coming closer to someone or something, particularly in a social context.

Wrong options:

• hiding: The word 'hiding' implies concealment and does not fit the context of coming closer to another octopus.
• conveying: The word 'conveying' is a gerund that refers to communication, which does not fit the context of physical proximity.
• signs: The word 'signs' is a noun that does not relate to the action of moving closer and does not fit grammatically.
• turn: The word 'turn' is a noun that refers to a change in direction, which does not fit the context of approaching another octopus.
• moving: The word 'moving' is a gerund that implies motion but does not specifically indicate the action of coming closer in this context.
• reassuring: The word 'reassuring' is an adjective that describes a comforting action, which does not fit the context of approaching.

Correct answer: signs

Explanation: The word 'signs' is a plural noun that refers to indicators or symbols of submissiveness. It fits grammatically as it serves as the object of the preposition 'as' and aligns with the context of communication through gestures.

Meaning: 'Signs' refers to indicators or symbols that convey meaning, particularly in the context of behavior or communication.

Wrong options:

• hiding: The word 'hiding' is a gerund that implies concealment and does not fit as an indicator of behavior.
• conveying: The word 'conveying' is a gerund that refers to the act of communication, which does not fit as a noun indicating behavior.
• turn: The word 'turn' is a noun that refers to a change in direction, which does not fit the context of indicating submissiveness.
• approaching: The word 'approaching' is a gerund that indicates coming closer, which does not fit as a noun indicating behavior.
• moving: The word 'moving' is a gerund that implies motion but does not fit as a noun indicating signs of behavior.
• reassuring: The word 'reassuring' is an adjective that describes a comforting action, which does not fit as a noun indicating behavior.

Correct answer: turn

Explanation: The word 'turn' is a noun that indicates a change in position or response. It fits grammatically as it serves as the subject of the clause and aligns with the context of the dominant octopus's reaction.

Meaning: 'Turn' refers to a change in direction or response, particularly in social interactions.

Wrong options:

• hiding: The word 'hiding' is a gerund that implies concealment and does not fit as a noun indicating a response.
• conveying: The word 'conveying' is a gerund that refers to communication, which does not fit as a noun indicating a response.
• approaching: The word 'approaching' is a gerund that indicates coming closer, which does not fit as a noun indicating a response.
• moving: The word 'moving' is a gerund that implies motion but does not fit as a noun indicating a response.
• reassuring: The word 'reassuring' is an adjective that describes a comforting action, which does not fit as a noun indicating a response.
• signs: The word 'signs' is a plural noun that refers to indicators, which does not fit as a noun indicating a response.

Correct answer: reassuring

Explanation: The word 'reassuring' is an adjective that describes the nature of the signals given by the dominant octopus. It fits grammatically as it modifies the noun 'signals' and aligns with the context of providing comfort.

Meaning: 'Reassuring' means providing comfort or confidence, particularly in a social interaction.

Wrong options:

• hiding: The word 'hiding' is a gerund that implies concealment and does not fit as a descriptor of signals.
• conveying: The word 'conveying' is a gerund that refers to communication, which does not fit as an adjective describing signals.
• turn: The word 'turn' is a noun that refers to a change in direction, which does not fit as a descriptor of signals.
• approaching: The word 'approaching' is a gerund that indicates coming closer, which does not fit as a descriptor of signals.
• moving: The word 'moving' is a gerund that implies motion but does not fit as a descriptor of signals.
• signs: The word 'signs' is a plural noun that refers to indicators, which does not fit as an adjective describing signals.