The most common theories of evolution hold that all creatures that now live on land evolved from sea creatures. But that does not mean taht human beings are descended from whales or any other kind of organism that is living in the sea today. Instead, it means that humans and sea creatures have common ancestors.
Evolutionary theories argue that all life began in the seas. So at one time, the only forms of life on Earth were sea creatures. Eventually, some of these organisms adapted to life on land. Clearly, this took place a very long time ago. We see this because terrestrial life forms are so varied -- they have clearly had a very long time in which to evolve.
No comments:
Post a Comment