the fact that over 90% of species d individuals have an elongated feeding appendage on segment 4 means that this trait must be controlled by a dominant allele. [ choose ] any mutation in the dna sequence of the msh gene, which only controls feeding appendage length, will impact feeding appendage length. [ choose ] natural selection results in generating, not eliminating, new phenotypes in these crustaceans. [ choose ] more information is required to determine if the difference in number of feeding appendages between species c and d are adaptations.