1. Classifying Animals
Chapter 1 Lesson 3

2. What are simple invertebrates
Animals that do not have a backbone
They can live on land and in the water

3. Sponges They do not have true organizations
They are the only animals without real tissues or organs
They are members of the phylum Porifera. All members of this phylume live in water

4. Cnidarians Jellyfish, sea anemones, corals, and hydras
Soft-bodied, aquatic creatures
Radial symmetry, tentacles, muscle tissues, stinger cells, and a mouth

5. Worms Three main worms: flatworms, roundworms, and segmented worms
Have bilateral symmetry

6. What are complex invertebrates?
Echinoderms
Mollusks
Have muscular foot or tentacles, a fold of tissue, and a mass of internal organs
Squids, snails, clams, octopus
Almost all have a shell
Gills for breathing, heart, and well-developed nervous system
Sea stars, sea urchins, sea cucumbers
Have a skeleton located inside the body called endoskeleton.
Have many tube feet that cling like suction cups

7. Arthropods
Most numerous animal group of Earth with more than half of the world’s animal species included
Spiders, crabs, and insects
They are small and light with a hard skeleton on the outside of the body called an exoskeleton. This provides strength and protection

8. Arthropod
Echinoderm
Mollusks

9. What are vertebrates? Fish
Fish are cold-blooded
Fish have gills that allow them to breathe under water
There are 3 classes of fish: jawless, cartilaginous fish, and bony fish

10. Amphibians Frogs, toads, and salamanders Cold-blooded
They bridge the gap between land and water vertebrates because they spend part of their lives in the water and part on land (frogs)
They have gills but develop into lungs

11. Reptiles True land animals with one or two lungs
Thick, scaly, waterproof skin
Lizards, snakes, turtles, alligators, and crocodiles
Cold-blooded. They stay warm by sunning themselves

12. Birds Have two legs, and two wings
FEATHERS- these are specific to birds
Feathers keep heat inside the birds’ bodies
Birds are warm-blooded and maintain a constant temperature

13. Mammals Milk, hair, and large brains are key characteristics
Monotremes are mammals that lay eggs: duck-billed platypus & anteater
Marsupials are pouched mammals that give birth to partially developed offspring: kangaroos and koala bears
Placental mammals develop within its mother
Whales, dolphins, humans, dogs, elephants, tigers
Milk, hair, and large brains are key characteristics
They produce milk to feed their young
All mammals have hair or fur
Mammals are warm-blooded