A control group is important to a controlled experiment because it is used in an experiment to establish its validity.
Answer:
pollution of water. or do you mean pollutant in which case would be like garbage or oil spills
Your DNA is comprised of chromosomes which is comprised of genes. Your genes determine which inherited traits you receive from your parents. When you parents "make you" they each donate 16 chromosomes that contain many genes. These chromosomes make up your DNA, which effects your inherited traits such as, eye color, and hair color.
Hope this helps!
Abundant (now I'm just adding characters)
