Describe very briefly the contribution of the following scientists :
(1) Jan Ingcnhousz
(2) C.B. Van Niel
(3) Joseph Priestly
(2) C.B. Van Niel, proposed that the oxygen produced during the photosynthesis comes from water and not carbon dioxide.
(3) Joseph Priestly reported that green plants purify the air and restore to the air whateever the burning of candle or breathing animals remove from the air.