Question

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which term describes the relationship in which one organism lives inside the other one.
phagocytosis
endosymbiosis
symbiosis

Explanation:

1. Analyze the meaning of each term:

• Phagocytosis: The process by which a cell engulfs and digests particles or other cells. It is mainly about cell eating, not about the relationship where one organism lives inside another.
• Endosymbiosis: The term "endo" means inside, and symbiosis is a close relationship between organisms. So endosymbiosis specifically refers to a relationship where one organism lives inside another.
• Symbiosis: A general term for a close and long - term biological interaction between two different biological organisms. It does not specifically imply that one lives inside the other.

1. Based on the definition of the relationship (one organism lives inside the other), endosymbiosis is the correct term.

Answer:

endosymbiosis