The oxygen produced during photosynthesis comes from the photolysis of water was first proved by:

Evaluate the following statements regarding $T$. $W$. Engelmann's experiment:
$1.$ $T$. $W$. Engelmann stated that chlorophyll present in algae absorbs light of green and orange colors,splits water molecules by photolysis,and releases $O_2$.
$2.$ Aerobic bacteria accumulate near the algae to utilize the released $O_2$.

Through the use of oxygen $-18$ (heavy oxygen),scientists have found that the oxygen released during photosynthesis comes from molecules of

Which scientist used aerobic bacteria,a prism,and green algae in his experiment?

Who discovered that green plants take in $CO_2$ and release $O_2$?

$A$ milestone contribution to the understanding of photosynthesis was made by Cornelius van Niel,which was based on the studies of