original: Their unusual size is attributed to island gigantism, since there are no other carnivorous animals to fill the niche on the islands where they live, and also to the Komodo dragon's low metabolic rate.
simplifications: Their unusual size is attributed to island gigantism. They have a low metabolic rate and no competition for food on the island. Their unusual size is believed to be island gigantism. Also because there are no other carnivorous animals on the islands where they live, and also to the Komodo dragon's low metabolic rate. Island gigantism accounts for the unusual size. The Komodo dragon has a low metabolic rate. This accounts for their size too. Their unusual size may be caused by island gigantism, since there are no other meat-eating animals on the islands where they live. It may also be caused by the Komodo dragon's low metabolic rate. Their unusual size is because of island gigantism and the Komodo dragon's low metabolic rate. There are no other animals that eat meat on the islands where they live. Their large size is the result of island gigantism. There are no other predators to compete with them and they process food slowly. Their unusual size is attributed to island gigantism. This is because there are no other carnivorous animals on the islands where they live as well as the Komodo dragon's low metabolic rate. The odd size is of the Komodo dragon is credited to island gigantism, a low metabolism and a lack of other predators. Their unusual size is caused by island gigantism, because there are no other carnivorous animals to fill the place on the island. It is also due to the Komodo dragon's low metabolic rate. The Komodo dragons are relatively larger in size. This unusual large size is because there are no other meat eating animals on the their island. Also, it's because of Komodo dragon's low metabolic rate.