EVOLUTION In the beginning...
|After the mass extinction event at the K-T boundary 65
million years ago, large creatures such as the dinosaurs and many other
organisms disappeared. Mammals began to dominate the landscape. Some
began to fill the niches of the aquatic environments that had lost large
predators like the pleisiosaur and icthyosaur
. Food was abundant in the water and these mammals adapted to their
new environment by making the transition from land to water.
So what is the terrestrial ancestor?...