A population of mammals originally lived in a certain area surrounded by land. Then, some of the organisms were taken to an island. These two populations remained separated for hundreds of years.

Which of the following is most likely true of the organisms within the populations?

 A. 

The organisms on the island are slightly different than those on the mainland.

 B. 

The organisms on the island are exactly the same as those on the mainland.

 C. 

The organisms on the island are no longer a mammalian species like those on the mainland.

 D. 

The organisms on the island are completely different than those on the mainland.