The atomic mass for the element carbon (C) is 12.011. Explain how this number indicates that carbon is a mixture of isotopes. What is the mass number of the most common, naturally occurring isotope of carbon?

Need asap plz hurry im being timed when a body cell divides through the process of mitosis, the chromosomes in the daughter cells a. represent only the healthiest chromosomes from the parent cell. b. represent only half of the chromosomes in the parent cell. c. are identical to the chromosomes of the parent cell. d. are formed when chromosomes from the parent cell cross over.