in make u sick, as in 'wicked sick'. haha.....

Yes, it is. It means causing harm, or able to cause harm.

Insects harm trees by leaving their harmful bacteria which can spoil tree's branch or leaves and some insects are also capable in making whole into the tree's branch.Some insects like termite can spoil trees by eating their wooden branches.

Many natural resources are finite or limited. If they are not conserved and continue to be wasted as they are now, they will eventually run out.

bats can harm you if you try to harm them