The answer is true, they are only single celled!
This law states an organism has two different alleles for a trait and the allele that is expressed in the phenotype, masking the expression of the other allele,is said to be dominant. The allele whose expression is masked is said to be recessive.
Sea level - 100%
mid-level elevation - 4500M and 57%
Peak - 8850M and 33%