In my opinion trees does not require much help from us, as what we need from them.The main thing what we can do for them is not to disturb them.
'leave trees to grow in their own way'.
To help them swing from tree to tree.
The way a tree can help u because it ablse you to breath and live
They hold the tree up and they help the tree get the water and nutrients that it needs.
Moss grows more thickly on the North side of a tree. Hugging the tree will help you find which direction North is.
Banyan tree has hanging roots. They help the tree to breathe easily.
the roots help the tree from falling down
Monkeys have tails to help go from tree to tree and for balance.
it help it climb and attach to a tree
I would sugest calling an arborist. They could help you. I think that's who you would call if you had a sick tree.
They can help by eating the bad part of the tree.
trees help clean the air
Oive Tree, i believe. Hopes that help!