<u>My work:</u> Acid rain is a big pollution. Acid rain is caused by smoke in a rain cloud do to pollution from smock factories.This make A correct, because even if though Sewage treatment plants clean pollution they produce pollution from there plants.
Alkenes, A hydrocarbon with at least one carbon–carbon double bond that is unsaturated. An unsaturated hydrocarbon with at least one carbon—carbon triple bond between two carbon atoms is known as an alkyne.
Individual Characteristics are properties of physical evidence that can be attributed to a common source with a high degree of certainty. Examples of individual evidence include anything that contains nuclear DNA, toolmarks, and fingerprints.
