Ancient stone tools, poisonous plants, DNA, fossil skulls and tamarin monkeys all have something in common: they are all clues that help explain why all life on Earth, including humans, evolves over generations.
Added by Upcoming Robot on January 2, 2010
Judith Lewis - deCabbit
WOOHOO! I'm in and it was super easy - come on folks - we're about to start but we haven't started yet - hurry on in!!