The first tetrapods (four-legged animals) were amphibians, which evolved from a specialized group of lobed-fin fish. an unusual
fossilized animal (named tiktaalik) was recently found; this animal possessed a mixture of fish and amphibian characteristics. what is the term used to describe such an intermediate organism?
Organisms or fossils that exhibit both the traits of their ancestors and the forms of the more modern descendants are called transitional forms. The term "missing link" is also sometimes used to describe organisms that can bridge the gap between the traits found in an ancestor and its descendant.
