What is the longest river in the world

What is the primary justification of the hypothesis that the early earth environment was void of oxygen? ( 2 points) data showing the concentrations of gases extracted from rocks fossil evidence regarding the origin of eukaryotes generally accepted atmospheric conditions molecular evidence based on evolutionary traits.

Amountain created from tectonic activity would be considered which type of landform ? a) primary landform b) secondary landform

Which two nations are doing the most to combat their environmental issues?