Need help about this question of fish.. Thank you for responding 
3. How do the teeth and tongue help with the digestive system?
7. Do the teeth and tongue help with chemical or physcial changes?
11. Is the stomach hollow or solid?
12. How does the shape of the stomach help it to do its job?
17. Is the intestine hollow or solid?
18. How does the shape of the intestine help it to do its job?
20. The liver is not hollow. How can it still do its job?
26. How does the length of the digestive system compare to the length of the fish?
27. How does the great length of the digestive system help it to do its job?
30. What are different and are alike of the human digestive system and the fish?
3. How do the teeth and tongue help with the digestive system?
7. Do the teeth and tongue help with chemical or physcial changes?
11. Is the stomach hollow or solid?
12. How does the shape of the stomach help it to do its job?
17. Is the intestine hollow or solid?
18. How does the shape of the intestine help it to do its job?
20. The liver is not hollow. How can it still do its job?
26. How does the length of the digestive system compare to the length of the fish?
27. How does the great length of the digestive system help it to do its job?
30. What are different and are alike of the human digestive system and the fish?