The concept of endosymbiosis is widely accepted.What kind of relationship is it?

Question

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Endosymbiosis is a type of relationship in which both organisms in the partnership benefit. This is because one organism (the endosymbiont) lives inside another organism (the host) and provides a useful function, such as producing energy through photosynthesis. In return, the host provides a safe environment and nutrients for the endosymbiont. Both organisms benefit from this arrangement.

The Concept of Endosymbiosis Is Widely Accepted