There was no life. UV destroyed it all.
The formation of the ozone layer
The formation of the ozone layer, which absorbs harmful ultraviolet (UV) radiation from the sun, was crucial for enabling organisms to colonize land. By filtering out much of this radiation, the ozone layer created a more hospitable environment, protecting terrestrial life forms from DNA damage and other harmful effects of UV exposure. This allowed plants and animals to thrive and evolve in terrestrial ecosystems, ultimately leading to the rich diversity of life we see today on land.
Sleet forms when snowflakes partially melt as they fall through a warm layer of air before refreezing into ice pellets before reaching the ground. This can happen when there is a warm layer of air above a layer of subfreezing air near the surface.
Ozone has nothing to contribute in cloud formation. It is all done in the troposphere layer.
The formation of the ozone layer
The formation of depletion layer of ozone is due to human made ODS. They react with the ozone layer and then deplete it.
We have to protect the ozone layer to allow human existence. This existence of ozone is the reason behind human survival.
the troposphere supports the life.
If your question is 'Is the trophoblast present during germ layer formation (i.e. gastrulation) ?' then the answer is YES
The formation of the ozone layer
Ozone layer's existence was found in late 1800's. It was founded by Mario Molina.
UV rays formed the ozone layer. They also destroyed the ozone.
The formation of the ozone layer, which absorbs harmful ultraviolet (UV) radiation from the sun, was crucial for enabling organisms to colonize land. By filtering out much of this radiation, the ozone layer created a more hospitable environment, protecting terrestrial life forms from DNA damage and other harmful effects of UV exposure. This allowed plants and animals to thrive and evolve in terrestrial ecosystems, ultimately leading to the rich diversity of life we see today on land.
Sleet forms when snowflakes partially melt as they fall through a warm layer of air before refreezing into ice pellets before reaching the ground. This can happen when there is a warm layer of air above a layer of subfreezing air near the surface.
Ozone has nothing to contribute in cloud formation. It is all done in the troposphere layer.
Ozone layer absorbs the UV rays of the sun. They are fatal for life on earth.
Stratus corneum