ATP isn’t very stable, and a system that could take it in undamaged would be wide open for infectious substances. Also, why not eat the entire food when it contains loads of other useful stuff for the body? Gaining energy is only one aspect of eating. There exist symbiotic relationships where organisms (usually plants and fungi) give much more fine-tuned contributions to eath others’ metabolisms, but whether actual ATP is ever exchanged I don’t know.
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