If you compost an apple and feed it to an tree is that cannabilism?

Not really.

If you put ground-up chicken parts in chicken feed (a common practice), THAT is forcing the chickens into cannibalism.

Depends. Is the tree an apple tree?😉

No, the micro-organisms in the ground will have eaten the apple and then the tree will have eaten what's left.

Trees reabsorb the nutrients that decompose from their own leaves, needles, bark, nuts and fruit all the time. But then you already knew that.

No. I never heard of this. Cannabilism pertaind to eating human flesh.

If you ate human hair is that cannibalism?

No, but if you ask questions like this that makes you a d*ck.

nope

depends on the cores and effects

No, recycling.