In parts the United States male deer now become reproductive

In parts the United States, male deer now become reproductively mature 1-2 years earlier and with smaller antlers than recorded historically. You compare DNA extracted from recently collected deer antlers to DNA from deer antlers collected 150 years ago. You discover that, in addition the size of antlers becoming smaller over time, the genetic composition of deer populations has shifted considerably over this period. What might you conclude from this observation? sympatric speciation has occurred evolution has occurred reproductive incompatibility has developed All of the answers are correct current deer would have been unable to breed with deer from 150 years ago

Solution

The answer is: evolution has occured.

Mutations in the DNA is mainly responsible for evolutionary change in the perticular traits of a organism. The mutations may cause benifit or harm to the organisms. As the organism passes from one generation to another generation, these mutations also carries to the next generation.