Can it be said that Priestly's experiment helped us to find out more about composition of air ? How ?

Find out more about artifical glaceries.

What did Priestly hypothesize on the experiment he conducted on the role of air in the growth of plants ?

Which one of the followig methods can be used to find out the percentage composition of halogen present in an organic compound ?

How do Hydrangea plants help us to find the nature of the soil ?

How it can be said that light posses wave nature?