Task 4 Find definitions of the words

1. a volunteer - c) a person who does services without payment or reward
2. ecology - f) the relation of plants and living beings to each other and to the environment
3. to recycle - b) to treat smth that has already been used so that it is fit to use again
4. rubbish - d) things of no use that are thrown away
5. a nesting box - a) a box for birds to nest in
6. to clean out - e) to make free from dirt and rubbish