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Standard: S4L2-a

a. Identify external features of organisms that allow them to survive or reproduce better than organisms that do not have these features (for example: camouflage, use of hibernation, protection, etc.)
Some scientists think that none of the dinosaurs lived under water but a few dinosaurs may have been able to keep their bodies under water for different amounts of time to catch fish. None of the dinosaurs could swim. The diplodocus, or the long neck, could go in the water but still breathe because its really long neck would stick out of the water. Therefore, it could get away from the meat eating dinosaurs that were on land. This helped the diplodocus so it could get away from other meat eating dinosaurs like the T-Rex and others.
  Diplodocus in water
Not all dinosaurs lived at the same time or place. During the 180 million years ago that dinosaurs walked on earth, they finally all died. Scientists do not really know the kinds of habitats dinosaurs lived in because there is little information they can use from the dinosaurs' fossils. Some dinosaurs were meat eaters. A meat eater only eats meat and nothing else. Another word for  meat eater is carnivore. 

Other types of dinosaurs were herbivores. They were animals that ate only plants.  They were also called plant eaters. Then there is the omnivore which ate both plants and meat.
Some dinosaurs were enormous animals. One was the Tyrannosaurus rex. He was really big. Others were just small, tiny creatures that ate plants but they only nibbled on the plants. Scientists split dinosaurs into two groups. One group is sauropods that walked on all fours and they ate plants. 
Ceratosaurus nasicornis
The second group is theropods that had more stuff including sharp teeth.  One example is the ceratosaurus that had hornlike knobs sticking out of its skull.  Some of the dinosaurs had much longer legs than the others. Some had two legs and others had four legs. Also, some had huge necks that were really, really long. 

There were also plant-eaters and meat-eaters. Some of their names sound really funny. Do you want to know what one is? It has a really long neck and tiny head . . . it's a Therupod. There are lots more than this. Some had feathers. Some feathers were all different colors. Even one type of dinosaurs has hip bones that look like you could find it in a  bird that we have today. Scientists aren`t studying real live dinosaurs so they can`t tell everything the same as it really was.                                                                                                                                                                                                                         
Some dinosaurs had adaptations that helped them save their lives. Adaptations are things that help animals survive. Look at this video. At the bottom of the video it tells about what is going on.

t rex

This video shows the stegasaurus is defending itself by the spikes on its back and with his tail that he can swing and hit the predetor. When the T -Rex tries to eat the stegasaurus he can`t because because the spikes on the stegasaurus`s back causes the T-Rex to give up. This is all because of the stagasaurus's adaptations. His adaptation saved him from being eaten.
If you  would like to learn more about dinosaurs, click on Dinosaur Dig which is a fun game that will teach you more about dinosaurs.