Question

who found that "if animals were making the air impure ,plants were making it pure.

Answer 1

Joseph priestly discover

Answer 2

Joseph Priestley discovered  oxygen in 1974, was the person to explain the oxygen and its role. He named it as" if animals were making the air impure, plant were making it pure".

EXPLANATION:

This concept means that plant releases them oxygen in to atmosphere, but animals and human release the carbon dioxide during respiration. Humans are responsible for huge impact on surrounding atmosphere effect via various industrial or factories. They spoil the surrounding atmosphere with 'carbon dioxide' and 'carbon monoxide gases'.