Nitrogen is one of the elements found in the body
Uncontaminated. it allows researchers or forensics to compare it with another sample
Dont live in the same climate or region. Just a guess. Hope this helps.
Answer:The Ozone Hole. One billion years ago, early aquatic organisms called blue-green algae began using energy from the Sun to split molecules of H2O and CO2 and recombine them into organic compounds and molecular oxygen (O2). ... As oxygen in the atmosphere increased, CO2 decreased.
