Becker proposed that __ was the result of a substance called phlogiston

Combustion of a substance

Explanation:

Johann Becher in 1669 proposed that all the material are composed of the rocks, water and the oils present in the Earth.

When the material is burned, the oil present in the material which is responsible for the combustion. The oil is escaped into the atmosphere which is released through fire and flames are the signs that it is releasing.

In 1703, George Sthal renamed this combustible component called the "Phlogiston" which is taken from the Greek language to refer in flame.

Therefore, phlogiston is responsible for the combustion of a substance.