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 produce honey that we eat
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.
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.
The bees will fly from flower to flower, while doing this process, pollen grains will be stuck to the bee's hair on its legs and when it reaches another flower, the pollen grains will fall off the bee's leg to the flower, therfore fertilising the flower.
Go to Planned Parenthood's site where on the right you can click on "Tools for parents". They will give you very helpful tips on how to speak to your kids about the birds and the bees and the different aspects of it. They also have "Tools for teens".
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It helps them to be cuddly and warm when it's so cold outside. And it helps them from getting stung by bees when they raid the honeypot!