1. Digestion can not All animals are heterotrophs – they can not make their own food Digestion – process of breaking down food into smaller molecules that the organism can use Absorption – method by which cells take up the digested nutrient molecules

2. Types of Digestive Tracts

3. Filter Feeder Filter Feeder: animals that eat by separating food particles from water

4. Types of Digestive Tracts Filter Feeder Gastrovascular Cavity Gastrovascular Cavity: 1 opening where food goes in and wastes go out

5. Types of Digestive Tracts Filter Feeder Gastrovascular Cavity Complete Digestive Tract Complete Digestive Tract: 2 openings where food goes in (mouth) and wastes go out (anus)

6. Porifera are filter feeders They eat bacteria Cells called ameobacytes carry the nutrients throughout the whole sponge Porifera - Sponges

7. PLATYHELMINTHES - FLATWORMS Flatworms eat tiny crustaceans, protists, or other flatworms depending on their habitat.

8. 8 Annelids – Segmented Worms Earthworms eat the plant and animal matter in dirt. They have an esophagus for the food to go down, a crop which stores food, a gizzard which grinds the food, an intestine to remove nutrients from the food, and an anus to expel all unabsorbed material

9. Arthropods Arthropods exhibit every type of feeding mode. They include carnivores, herbivores, detritus feeders, filter feeders, and parasites, and there are specializations within these major categories.

10. Echinodermata – starfish, etc Starfish digestion is carried out in two stomachs: the cardiac stomach and the pyloric stomach. The cardiac stomach, which is a sack like stomach located at the center of the body may be everted—pushed out of the organism's body and used to eat and digest food. The cardiac stomach is then brought back inside the body, and the partially digested food is moved to the pyloric stomach. Further digestion occurs in the intestine and waste is either excreted through the anus. http://www.youtube.com/watch?v=rE8l- KFQlhY&feature=related Starfish eat clams, muscles, oysters

11. Chordata-Aves What do birds eat?

12. Human Digestion What do humans eat?