A.I. Explanation:

Correct answer: exposed

Explanation: The word 'exposed' is the past participle form of the verb 'expose,' which fits grammatically as it describes the state of the skin when it is directly subjected to sunlight. This aligns with the context of discussing how sunlight affects vitamin D production.

Meaning: 'Exposed' means to be made visible or subjected to something, in this case, sunlight.

Wrong options:

• disposable: 'Disposable' is an adjective that refers to items meant to be used once and discarded, which does not fit the context of skin and sunlight.
• tan: 'Tan' is a verb that refers to the process of skin darkening due to sun exposure, but it does not describe the state of being subjected to sunlight.
• absorption: 'Absorption' is a noun that refers to the process of taking in substances, which does not fit grammatically as it does not describe the skin's state.
• screen: 'Screen' is a noun or verb that refers to a barrier or the act of shielding, which does not apply to the context of skin being directly subjected to sunlight.

Correct answer: absorption

Explanation: The term 'absorption' is a noun that refers to the process of taking in nutrients, which fits grammatically as it is the object of the verb 'helps.' This aligns with the context of discussing how vitamin D aids in calcium intake.

Meaning: 'Absorption' means the process by which substances are taken in, particularly nutrients by the body.

Wrong options:

• disposable: 'Disposable' does not relate to the context of nutrient intake and is an adjective that describes items meant for single use.
• tan: 'Tan' is a verb or noun related to skin color change due to sun exposure, which does not fit the context of calcium intake.
• exposure: 'Exposure' is a noun that refers to the state of being subjected to something, but it does not fit as it does not relate to the process of nutrient intake.
• screen: 'Screen' does not fit as it refers to a barrier or protective measure, which is unrelated to the process of absorption.

Correct answer: exposure

Explanation: The word 'exposure' is a noun that refers to the state of being subjected to something, in this case, sunlight. It fits grammatically as it serves as the object of the verb 'provide,' aligning with the context of discussing sunlight's role in vitamin D production.

Meaning: 'Exposure' means the condition of being exposed to something, particularly sunlight in this context.

Wrong options:

• disposable: 'Disposable' is an adjective that does not relate to the context of sunlight and vitamin D.
• tan: 'Tan' is a verb or noun that refers to skin darkening due to sun exposure, which does not fit the context of providing vitamin D.
• turn: 'Turn' is a verb that does not fit as it does not describe the state of being subjected to sunlight.
• screen: 'Screen' refers to a barrier or protective measure, which is not relevant to the context of sunlight exposure.

Correct answer: turn

Explanation: The word 'turn' is a verb that fits grammatically as it describes the action of the skin changing color due to sunlight. This aligns with the context of discussing how the skin reacts to sun exposure.

Meaning: 'Turn' means to change or become, in this case, referring to the skin changing to a pink color due to sun exposure.

Wrong options:

• disposable: 'Disposable' is an adjective that does not relate to the action of the skin changing color.
• tan: 'Tan' is a verb that refers to the process of skin darkening, which does not fit the context of turning pink.
• absorption: 'Absorption' is a noun that does not describe an action and is unrelated to the skin's reaction to sunlight.
• screen: 'Screen' does not fit as it refers to a barrier or protective measure, which is not relevant to the action of the skin changing color.