The sea slug Elysia chlorotica absorbs chloroplasts from the algae Vaucheria litorea as it digests the algae.This allows the sea slug to live on sunlight and carbon dioxide.This suggests that:

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The fact that Elysia chlorotica can survive solely on the chloroplasts it has ingested from Vaucheria litorea suggests that chloroplasts alone are sufficient for photosynthesis. This is supported by studies that have shown that the sea slug can actively maintain the chloroplasts inside its cells and utilize them to produce energy through photosynthesis.

The Sea Slug Elysia Chlorotica Absorbs Chloroplasts from the Algae