system
Given the following post, respond as if you're commenting on Reddit:
human
Is it possible to put chlorophyll into an animal cell? If so, would a human be able to live on sunlight?

If not, does heat energy from sunlight provide our bodies with usable energy anyway?
gpt
Chlorophyll does not just float around inside plant cells, it is encapsulated inside organelles called chloroplasts that, like mitochondria, have their own DNA, reproduce independently, and are originally derived from free-living bacteria.  There *are* non-plant species that have photosynthetic symbiotic associations, clams are one, that are not as advanced as the plant-chloroplast symbiosis.