they produce honey that we eat
Bees are helpful to us by making honey and speading pollenation
BEES
they let bees build hives in them
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.
they spread pllen
They are neither helpful or harmful. Carpenter bees do not harm humans as they have no stings. They eat and bore holes into wood which may be a problem not any help.
By pollinating flowers, fruit and vegetables.
Beekeepers are people who raise bees. They are scientist who are generally studying bees' behavior. Some people keep bees to get honey, as well.
Bees collect the nectar from plants, which they use to create honey to feed on for themselves and for their larvae. In turn, the plants are able to be pollinated also.
People can help bees by leaving glasses of water and sugar mixed together to give bees energy.
If bees feel frightened of you/other people, then they will string you. There are probs loads of people getting stung by bees every day.
The bees make honey that people use for food and other things.