Answer: A
Explanation: PCR help to create multiples of copies, it can produce millions of copies of DNA sequence in a test type in limited or few hours. PCR has revolutionize molecular biology, and it has become an essential tools for biologist, physicians or anyone who really want to work on the DNA.
I suggest that you should try C......
Answer:
Common examples of physical contaminants include hair, bandages, fingernails, jewelry, broken glass, metal, paint flakes, bone, the body parts of pests, or pest droppings.
Explanation:
spongy bone is found in the bones of the skull, sternum, vertebrae, the pelvis, the lining of the marrow cavity and the epiphysis.
The atmosphere is a mixture because it contain many types of gases , liquids and solids.
