This is the reason, that before the creation of the ozone layer on Earth, 600 million years ago, life on Earth was so deep in the ocean so that harmful radiation could not reach it. But photosynthesis was still possible. When life came out of the water and landed on the ground due to evolution, to some extent, the ozone level is also credited for this. Only after the development of the ozone layer, complex multicellular organisms were able to live in the sea at shallow depths. They got more exposure to sunlight and eventually, they were able to live on land.
Before the formation of the ozone layer, there was nothing to protect the earth from harmful radiation. But only 50-60 million years after its formation, we saw diversification in life. Though this happened millions of years ago, humans only came to know about these only 200 years ago.
In March 1839, a scientist at the University of Basel, Switzerland, Christian Schönbein, was experimenting with the electrolysis of water. By using electricity, he was separating water into oxygen and hydrogen. While doing these experiments, he noticed a strange smell. This smell was emitted by a gas. And when he isolated this gas, he named it Ozone. The word Ozone actually comes from the Greek word Ozein, which means to smell.
