Evolution can be described as a change in species over time. Dinosaur fossils are significant evidence of evolution and of past life on Earth.
Evolution of Life The diversity of life on Earth today is the result of evolution. Life began on Earth at least 3.5 to 4 billion years ago, and it has been evolving ever since. At first, all living things on Earth were simple, single-celled organisms. Much later, the first multicellular organisms evolved, and after that, Earth’s biodiversity greatly increased. Figure below shows a timeline of the history of life on Earth. You can also find an interactive timeline of the history of life at the link below. |
Today, the most accepted theory of life on Earth is evolution, and there is a vast amount of evidence supporting this theory. However, this wasn’t always the case.
As you view Introduction to Evolution and Natural Selection, focus on these concepts:
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