If a tree falls in the forest where there in no one to hear, does it make a sound ?

How do we hear sound?

A big tree falls in a forest its roots are still in contact with the soil. The branches of this fallen tree straight up. This happens in response to…………

An instrument used to hear the heart sounds

It takes 17 full specific type of trees to make one tonne of paper. If there are 221 such trees in a forest, then what fraction of forest will be used to make 5 tonnes of paper.

A big tree falls in a forest but its roots are still in contact with the soil. The branches of this fallen tree grow straight up (vertically). This happens in response to