Answer:
All of the above.
Reason:
paper we get from trees in which we write even many knowledge and valuable things are written in paper which is of tree only.
food is necessary for human being to live stain live. it is because of food only.
wood is needed during the winter to keep ourselves warm it is also needed in cooking food at many villages and towns. and the main thing coal by which we get electricity is also made from wood only.