they let bees build hives in them
Nature is helpful in many ways, trees give us oxygen to breathe, bees pollinate flowers to give us fruit, swallows stop us getting overrun by flies, its way too much to say in one wikianswer! XD
Bees are helpful to us by making honey and speading pollenation
Yes. Bees pollinate most flowers and trees. One of a bees favorite places is a orchard where fruit trees are everywhere.
we have 550 olive trees in northern CA and no bees.
BEES
in trees in trees in trees in trees
honey bees only make hives in trees and I see bees in the eves of the roof. honey bees only make hives in trees and I see bees in the eves of the roof.
It depends on what you define as helpful. Yes, all bees have a role in maintaining balance in their ecosystems, especially through pollination, but they are not neccesarily "helpful" to humans directly.
Honey bees.
Apple farmers need bees to pollinate their apple trees. Where bees have been eradicated by pesticides, more bees, or hand pollination, are necessary for the trees to bear fruit.
they spread pllen
eat the bees (it's quite nice on toast)