What could be the benefit of the relationship between the zoochlorella alga and the amoeba in which this alga often inhabits?

1) Amoeba protects zoohlorella from external conditions and supplies it with the necessary nitrogen for nutrition.
2) The animal receives sugar from algae formed during photosynthesis. (Amoeba is transparent and photosynthesis is normal).
3) In addition, during photosynthesis, algae releases oxygen, and the animal uses it for respiration.

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