Range from first to last the sediment particles based on the order they would be deposited as a river loses velocity

Which of the following is a reason why early living organisms on earth could not have survived on the surface? 1. the lack of an ozone layer 2. the lack of oxygen in the atmosphere 3. the fact that these organisms were single-celled

Due tonight 10 points will mark brain

Make a claim about the factors that cause inherited genetic variations within populations. also make a claim about the effects of mutations.