What are possible benefits and negative results we might expect if humans were genetically engineered to undergo photosynthesis?
How do plant and animal cells metabolize energy in complimentary ways?
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If humans were genetically engineered to undergo photosynthesis (if scientists could even do that!) they would need to stay in bright light a lot in order to synthesize food. That may be difficult to do, particularly if it's cold or wet outside.
What about their skin color? In order to photosynthesize, you need chlorophyll, a green colored piogment. I wonder if green skin would be a turn off to some? (It would be to me!)
Of course, on the other hand, when food ran out, humans could simply make their own by standing in ...
This job discusses photosynthesis.