Double E's
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.
Fruit trees attract bees when in bloom. Bees are also attracted to the sweetness of the fallen fruit. Apple, peach, pear, and cherry for example. Threr are always millions of honey bees that visit my plum and crabapple trees to collect pollen. (I live in North Carolina.)
they let bees build hives in them
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.
No, honey bees typically make hives above ground in structures like trees, caves, or man-made beehives. Ground-dwelling bees like mining bees or sweat bees may create nests underground, but honey bees do not.
eat the bees (it's quite nice on toast)
Bees will do this for you.
they can
Honey is made by bees, not trees.
No, but some bumble bees do. In the wild honey bees would be in natural cavities such as holes in trees.