Explain which cells, tissues, or organs should be modified to lead to successful photosynthesis in animals or humans. discuss how these compare to a plant's leaves. 

in order to do photosynthesis, an animal would need chloroplast. i don’t think any existing organ could be modified to become a chloroplast (as each has a vital function), but as has occurred in the past, an animal could incorporate a photosynthetic bacteria and absorb the chloroplast into itself.

answer; 4% i believe this is correct;