Why is the list of living donor organs much shorter than the list of deceased donor organs

It's easier to not care about your lungs and heart and retinas, etc when you're dead.

It's a bit hard to give away your heart while you're alive.

pregnancy happens more and more

phylogenetic tree is the tree of life or evolution tree. it shows the different branches of evolution. the sequence goes like tissues - coelom - backbone - endoskeleton - segmentation