Which of the following most logically completes the argument?
The camel is one of the most well known desert dwelling creatures. Camels were tamed and traded more than a thousand years ago. Prehistoric cave paintings in Egypt depict this animal with a large hump on its back. Fossils of this animal, however, do not show any hump. Nevertheless, there is no reason to conclude that the cave paintings are therefore inaccurate in this regard, since ______.