Scientists use the amount of radioactive isotopes found in rock and fossils to calculate their ages. this process is called what

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.

Eastern europe and parts of northern europe have which of the following climates?

Which anatomical feature would you expect to find in the fossil remains of a nocturnal species?