Until the early there were only negligible amounts of free oxygen in the atmosphere.

During the early earth, when photosynthesis has not yet evolved, there were only negligible amounts of free oxygen in the atmosphere. It was said that the Earth's  atmosphere had no free oxygen then. This is about 3.5 billion years ago.

Well i 5ink that 1 c ) 2 a) 3 a or c) 4 b ) 5 a) 6 i don’t know ) 7 i don’t know ) 8 a i think that’s right tell me if it’s not and sorry if therenot right too good day!

There is totally sun all the way down there.