1. Animals and their Characteristics

2. Invertebrates

3. Sponges Animals that have no true organization.
Asymmetrical: body plain cannot be divided into mirror images.

5. Cnidarian Soft-bodied, aquatic creatures.
Radial symmetry: body plan in which all body parts of an organsm are arranged around a central point.

6. Jellyfish

7. Sea Anemones

8. Corals

9. Worms
There are thre groups: flatworms, roundworms, and segmented worms.
Bilateral symmetry: is a body plain in which an organism can be divided along only one plane of their body to produce two mirror images.

11. Mollusks
Animals with a muscular foot or tentacles, a fold tissue called mantle, and internal organs.
Almost all mollusks have a shell.
Examples: snails, clams, and squids.

12. Snail

13. Echinoderms They have endoskeletons.
Use a water pressure system that helps them feed, breathe, and move.
Examples: sea stars, sea urchins, and sea cucumbers.

15. Arthropods The most numerous animal group on Earth.
They are small and light with a hard exoskeleton.
Examples: spiders, crabs, and insects.

17. Vertebrates

18. Fish
There are three classes of fish: jawless fish, cartilaginous fish, and bony fish.

19. Amphibians
Animals that spend part of their lives in the water and part on land.
Examples: frogs, toads, and salamanders.

21. Reptiles Animal with one or two lungs, thick, scaly, waterproof skin.
Examples: lizards, snakes, turtles, alligators, and crocodiles.

23. Birds
Animals that rather than four legs have two legs and two wings. Birds also have hollow bones to reduce their weight.

25. Mammals
Characteristics of mammals are that they have hair, milk to their young and have large brains.
They are divided into 3 subclasses

26. 1. Monotreme
A mammal that lays eggs.

28. 2. Marsupial
A pouched mammal. They give birth and then carry their young in a pouch on the front of their bodies.

30. 2. Placental mammals
The young develops within the mother.