2. the fourth grade Han Jang Hyeon

3.  Scientists classify animals based on features they share.  Features include coloring, type of teeth, and number of legs.  One feature scientists use to classify animals is whether or not the animal has a backbone.

4. Birds,

5. Those with BackbonesThose without Backbones

6.  Animals without a Backbone  Animals without Backbones are called Inverteb rates  Multicellular, no cell walls, reproduce sexuall y, heterotrophic.

7.  Sponges, Anemones and Jellyfish, Worms,  Snails, Clams and Octopuses,  Starfish and Urchins, Insects,  Spiders, Ticks, Lobsters,  Crabs, and Crayfish are all invertebrates

8.  Animals with a Backbone  Animals with Backbones are called Vertebrates

9.  Vertebrates Well-developed internal skeleton, highly developed brain; have advanced nervous system, outer covering of protective cellular skin.

10. Scientists divide vertebrates into five main groups.  fish  Birds  Amphibians  Reptiles  Mammals are all Vertebrates

11.  Are cold-blooded  Have gills and scales  Live in water  Have a Backbone

12.  Have feathers  Are warm-blooded  Have hollow bones and most can fly  Lay eggs  Have a Backbone

13.  Have scales  Live on land  Are cold-blooded  Usually lay eggs  Have a Backbone

14.  Live in water and on land  Are cold blooded  Have smooth skin  Lay eggs  Have a Backbone

15.  Have hair or fur  Are warm-blooded  Feed milk to their young  Bear live young (except monotremes)  Have a Backbone

16. Thank you so much by. Han Jang Hyeon