In a species of mice, short hair is dominant to long hair. If a short-haired individual is crossed with a long-haired individual and both long- and short-haired offspring result, one can conclude that (select all that apply): A: the short-haired individual is homozygous. B: the short-haired individual is heterozygous. C: the long-haired individual is homozygous. D: the long-haired individual is heterozygous. E: This cannot be answered without more information.