|
|
The first vertebrate flyer, the pterosaur, first took to the air 220 million years ago and eventually evolved to the size of a small airplane; comparing the fossil record to living birds.
|
Skin makes up 16 percent of a person's body weight and is the largest organ of the human body; skin allows birds to fly, enables mammals to nurse their young, and provides a lifelong defense against predators and parasites.
How humans' ability to communicate has defined them as a species; sharing information helps humans rise to the top of the food chain and dominate their environments; bacteria; fish; insects.
|
|
|
Top TV Shows |
All TV Shows |
Your Favorite Movies |
Privacy Policy |
Feedback
License Our Content | Media Kit | About Us | © 2013 TMS | Zap2it TV Listings |
