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's main function is to absorb and block the Sun's harmful ultraviolet (UV) rays, which can damage living organisms' DNA and cells. This protection allowed life to exist and evolve on Earth's surface. The other options are not the main contributions of the ozone - layer.

Answer:

It blocked the Sun's harmful UV rays.