Question

We usually think volunteer work takes up a lot of time. But just a little time and effort can be a big help to others. For example, you can be a big brother or sister to young children in an orphanage.
You can help people take care of old people in the nursing homes. *It can give you happiness when you give happiness to others.

(In this passages, what is the meaning of *it? )
helping people/volunteer work

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