Exercise 6

2. the distal end below tarsus
4. the posterior opening in the pharynx that leads to the stomach
9. a single-celled organism shaped like a miniature slipper
11. row of small conical teeth on the margin of the upper jaw; absent in toads
13. cartilage supportive element of the tongue
14. groove concave depression on one side of the anterior half of the organism
15. are numerous hair-like projections around the pellicle

1. two forward appendages
3. circular area of thickened membrane behind each
5. composed of organ system
6. self-fertilization
7. two small openings near the tip of the snout
8. lower eyelids, and the transparent third eyelid called nictitating membrane
9. the most posterior part of the mouth cavity
10. peculiar streaming movement
12. found at the dorso-lateral portion of the head; these protected by the upper