D - The organisms on the island are slightly different than those on the mainland.
The reason why this is the correct answer is because each successive generation on the mainland as well as the island both develop and continue adapting to their specific ecological niche and environment. They are, howerer, both still part of the same species.
It would be similar to bass dna since trout is another kind of fish like bass. They come from the same family group so it would be more similar to it.
The answer is halite i hope this helps
