The formula Fe2O3 tells us that one mole of Fe2O3 contains . A: 3 iron atoms and 2 oxygen atoms
B: 3 grams of iron and 2 grams of oxygen
C: 2 moles of iron atoms and 3 moles of oxygen atoms
D: 2 iron atoms and 3 oxygen atoms

Individuals within populations exhibit some diversity. as a result of possessing slightly different traits, some individuals are better able to survive and reproduce than others. if these individuals changes in the characteristics of the population may occur over time. the cumulative change in these characteristics is known as