Animal Evolution and Diversity: Big, Science-y Themes
Diversity
Why Aren't There Saber-toothed Cats in Your Yard?Animals come and go. Why are there so many kinds of animals? Why does the animal family tree change over time?The answer is evolution. Here are some...
Structure and Function
The Luck of the DrawNature doesn't get to start from scratch when it comes to baking up a new organism. Okay, the whole process started from scratch (billions of years ago), but scratch still meant...