How did the formation of the ozone layer contribute to the existence of life on Earth?

Around 600 million years ago, a thin ozone layer formed that was capable of protecting life from harmful wavelengths of UV radiation (wavelengths between 200-300 nm). ... In the Silurian, around 420 million years ago, ozone levels were high enough to allow for organisms to survive on land, without any shielding from water.

Explanation:

Around 600 million years ago, a thin ozone layer formed that was capable of protecting life from harmful wavelengths of UV radiation (wavelengths between 200-300 nm). ... In the Silurian, around 420 million years ago, ozone levels were high enough to allow for organisms to survive on land, without any shielding from water.

A. It blocked the Sun’s harmful UV rays.

Explanation:

50.23 i believe is correct but don't quote me on that.