So let's say I eat some lentils and I'm in caloric excess. The carbs of the lentils get turned into fat in my body and the protein turns into my muscles. The lentil plant died and part of it had become me. On some level the lentil plant has become conscious bc it is me.
Let's say I die and none of my friend will be cool and dump my dead body in the wood to decompose but they cremate me. Then dump me into a compost pile. Then some white button mushroom spores start growing on the ashes then make a fruiting body after decomposing my ashes. I have on some level become the same mushroom.
Then a deer or something eats said mushroom and the carbon n stuff that used to be my body gets turned into a deer.
The fact of life is if things are allowed to decompose life dies then turns into other life. We are nothing more than an amalgamation of a bunch of dead body all fused together to be conscious. So prob not quite what people mean when they see reincarnation but like people's bodies do turn into other living things.