The dark brown color of a penny is most likely oxidation, which occurs when the copper in the penny comes in contact with oxygen.<span> </span>
Missense Mutation. A nucleotide was substituted for another- and most importantly- changes the final amino acid.
Answer: Osteoclasts are the bone cells that break down bone.
Explanation:
According to http://www.ucsusa.org/global_warming/science_and_impacts/science/ozone-hole-and-gw-faq.html#.WQjhDfW...
I think the answer is B.CFC
