Question

how did the formation of the ozone layer contribute to the existence of life on earth?
it blocked the suns harmful uv rays.
it caused water vapor to cool, condense, and collect.
it released large amounts of oxygen into the air.
it warmed earths surface, preventing materials from freezing.

Explanation:

The ozone layer is crucial as it absorbs and blocks the Sun's harmful ultraviolet (UV) rays, which can damage living organisms' DNA and cells. Without this protection, life on Earth would be severely impacted by high - levels of UV radiation.

Answer:

It blocked the Sun's harmful UV rays.