Meaning: 'Interspecific' means occurring between different species, particularly in the context of ecological interactions.

Wrong options:

• scarce: Scarce means limited in quantity, which does not relate to the type of interactions being described.
• contradicts: Contradicts means to assert the opposite, which is irrelevant in the context of describing species interactions.
• meaningful: Meaningful implies significance but does not specifically describe the nature of interactions between species.

Correct answer: intimate

Explanation: The word 'intimate' fits grammatically and contextually as it describes a close and personal association between species, which is essential in the context of symbiosis. It conveys the depth of the relationship being discussed.

Meaning: 'Intimate' means very close or personal, indicating a strong bond between the species involved.

Wrong options:

• decent: Decent implies adequacy but lacks the depth required to describe a close relationship.
• doubts: Doubts refers to uncertainty, which does not apply to the nature of the association being described.
• deadly: Deadly suggests causing death, which contradicts the positive connotation of a symbiotic relationship.

Correct answer: benefits

Explanation: The word 'benefits' is grammatically correct and contextually appropriate as it indicates a positive outcome for both parties involved in the relationship, aligning with the definition of symbiosis in everyday language.

Meaning: 'Benefits' means advantages or positive outcomes that both parties gain from the relationship.

Wrong options:

• understanding: Understanding refers to comprehension, which does not fit the context of mutual advantages in a relationship.
• decreased: Decreased implies a reduction, which is contrary to the idea of mutual benefit.
• virtual: Virtual suggests something that is not physically present, which does not apply to the tangible benefits of a symbiotic relationship.

Correct answer: close

Explanation: The word 'close' fits grammatically and contextually as it describes the nature of relationships in symbiosis, indicating proximity and strong connections between species, which is essential to the concept being discussed.

Meaning: 'Close' means near or intimate, indicating strong relationships that can exist in symbiotic interactions.

Wrong options:

• open: Open suggests a lack of barriers, which does not convey the depth of relationships in symbiosis.
• murky: Murky implies unclear or confusing, which contradicts the clarity of relationships being described.
• angers: Angers refers to causing anger, which is irrelevant to the context of symbiotic relationships.