How is it that morphological data alone might lead scientists to group animals into erroneous evolutionary relationships?

Adigestive system that is a series of tubes beginning at the mouth and ending at the anus is a digestive system.

In a cross between individuals of a species of tropical fish, all of the male offspring have long tail fins, and none of the females possess the trait. mating two of the f1 fish fails to produce females with the trait. explain the inheritance pattern of the trait.

The relationship between intron and exon