What do you think earth's surface would be like if earth did not have an atmosphere

This shouldn’t come as much of a surprise. Since humans absolutely and entirely depend on the oxygen present in the atmosphere, there would be no chance of our survival if it didn’t exist. This is not only true of humans, but also of every creature that depends on oxygen, from the tiniest ants to the biggest blue whales all would perish.

Almost  no species would exist due to no oxygen, but if they did, they would die of harmful UV rays 

I  cant see the question.