If you mean "varieties" I think you are asking about the subject of biodiversity. Do a quick web-search for "importance of forest biodiversity" and you should be golden.
If you really mean verities i.e. "The quality or condition of being true, factual, or real"... I have no idea.
you need them because they give us air and their homes of millions of animals
80% of animals live in forests or trees.
forest animals
forests have a lot of trees plants and animals.
About as safe as anywhere else. Forests have fires and there are hunting seasons for animals.
yes
For animals that live there ... yes.
The plural noun "verities" means truths.The word sought may be the plural varieties (types, kinds).
Forests recycle the carbon dioxide in the air and turn it into oxygen. Almost all animals aon the planet need oxygen to survive.
It has 8.
Deer, rabbits, owls, moose, wolves and moose are all examples of animals that inhabit forests. Different animals inhabit different forests according to region.
no