If a scientist discovered a sequence of DNA that links the manatee a marine animal to there land dwelling ancestors which explains the likely effect of this discovery on the theory of evolution

The theory of evolution explains that species change in small ways through a gradual process of natural selection that occurs over the course of many generations. these small changes can eventually lead to entirely new species. if a scientist discovered a sequence of dna that links the manatee (a marine mammal) to their land-dwelling ancestors, which explains the likely effect of this discovery on the theory of evolution