We need trees because they provide oxygen and without oxygen we would not be able to breath in clean air. Imagine how sick everyone would be. So I think we can not live without trees.
No it is impossible for anyone to live without trees
yes. no.
We can not live with out trees
# # #
the bark protects trees from diseases and insects, it is pretty rare that a tree can live without it's bark for protection.
Yes humans can live with out heads if they are an zombie.
People cut down the trees that lemurs live in, leaving the lemurs homeless
yes actually trees live for about 400-800 years old. Humans live about 80-100 years old
no
grass we can always live without grass
Yes.
No. Koalas eat eucalyptus and live in those and other trees. Koalas are in danger from humans cutting down trees. No trees, no koalas.