C planting trees. It adds oxygen
Different types of species
The answer is Law of Dominance
DNA/fingerprints are all unique, therefor it is easy to match a fingerprint to a person thus they use this mechanism in criminal investigations because only one person woul have matching DNA to the prints on the scene, and that is the criminal.
Hope this helps :)
I believe the answer to be true
BUT I AM NOT 100% SURE!