Is the science of naming and classifying organisms based on structural comparisons and genetic evidence

Patient has just received an organ transplant which treatment would be most effective in preventing the patient’s body from

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

Which type of landforms forms at the plate boundary as a result of divergent stress