1. 1
F
F F F
F (sponges)
F (collar cell) F (choanocyte) F
1
F F F
F F
F F F F
F F F F F2
1. F (Choanocyte) F F (Flagellum)
1 F F
2. F (Amoebocyte) F F F F F

2. 2
F (hydra)
F F (gastrovascular cavity) F F
F (tentacle) F F
F
F 2 F F (extracellular digestion)
F F (gland cell) F F (intracellular digestion) F
F F F F F F
tentacle
Grand cell
Digestive cell
(Nematocyst) F (Tentacle) F F
F F F F F F F F F F
F F2
1. F F (Gland Cell) F F F F F F
F F F F F (Extracellular Digestion)
F F
2. FF (Digestive Cell) F F F Gland Cell F
F F F F F Food Vacuole F
F F (Intracellular Digestion)

3. 3
F (planaria)
F F F
F F F
F
(endoderm) F
F F
F
F F F F
(mouth) F F (sucker) F
F F F
F F F F (host) F FF F
F F
F F F
F

4. 4
F
F (oesophagus) (crop) (gizzard)
F (anus)
F
F F F
F
F (gastric caecum)
F F F (rectum)
F F F F F
F
F
1. (Mouth) F F
- F
- F
- F F
2. F (Salivary Gland) F F F F F
F F F
3. (Pharynx) F

5. 5
4. (Esophagus) F
5. (Crop) F
6. (Gizzard) F F
F F
7. F F F (Hepatic Caeca Digestive Caeca) F F F F F
F
8. (Stomach) F F F F F
F F F F
9. F (intestine) F F
10. F F (Colon) F
11. F (Rectum) F
12. (Anus) F F F F