[rustyhancock]

I believe that mitochondria and chloroplast both were originally independent single celled organisms.

So kind of funny that, chloroplast is being "stolen" again by this sea slug.

[chasil]

Chloroplasts are but one variety of plastids. Assimilation has occurred multiple times.

https://en.wikipedia.org/wiki/Plastid

[morphle]

Yes, it is funny that biological history repeats itself.

https://en.wikipedia.org/wiki/Symbiogenesis