(please note I am not challenging the scientific truth of evolution, I simply do not understand how something like this happens)
Or maybe it was photosynthesis first. The chloroplasts just did their thing for a while, and slugs that digested them slower (and eventually ones that stored them) got more benefit than ones that didn't.
Evolution isn’t a matter of faith, you’re welcome to challenge it and try to poke holes in it.
And if you want to do that, you should probably get a deep set of experience; otherwise, it's not much different from a flat earther.
I really like this version of it personally: https://www.youtube.com/watch?v=T6JFTmQCFHg
What would be extraordinarily interesting would be if we could find life on Earth with a fundamentally different biochemstry. Very different genetic code, even. This would be sign that Origin of Life is not the Great Filter. And we don't even have to go to another planet to conduct this search for "alien" life.
[1] Pale blue dot - Carl Sagan https://www.youtube.com/watch?v=wupToqz1e2g
https://en.wikipedia.org/wiki/The_Zoologist%27s_Guide_to_the...
So kind of funny that, chloroplast is being "stolen" again by this sea slug.
The surface is too small and you only get like 4% of the energy you need (Assuming you like being naked under full sunlight all day long. The article is for cows, but I guess the number is similar for humans.) 4% of 2400 kcal is almost 100 kcal, that is the content of a small diet treat or 2 apples.
These sea slugs can survive because they move very slowly. For a human, I think it's not enough energy to survive even if all the activity is to watch TV inside a hot swimming pool.
Assuming a spherical cow and a spherical human, the calories needed would scale with the radius cubed, whereas the calories gained from sunlight would scale with the radius squared. So while I agree this wouldn't be very many calories, even if you sat under the sun all day, I think the 4% figure is probably quite pessimistic.
Finally a good reason to assume a spherical cow!
