A cladogram is a diagram used in biology to show the relationships between different species. It looks like a tree with branches and shows how organisms evolved from a common ancestor.Derived characters are traits that appear in the most recent ancestor of a group but not in earlier ancestors. These traits help scientists group organisms based on shared features.For example, in a cladogram of vertebrates, having four legs is a derived character that separates amphibians, reptiles, birds, and mammals from fishes.