1. Snakes
They are found on every continent except Antarctica. ... Their fossil history is not very well known because snake skeletons are very delicate and do not fossilize easily. ... Over millions of years they lost their external limbs and their ears so they were able to burrow more easily. ... They are found in most warm parts of the world. ... The intestines and the gut fit in very easily because they are long and skinny. ...
- Word Count: 2917
- Approx Pages: 12
- Grade Level: High School