Malpighian tubules are
1. excretory organs of insects
2. excretory organs of frog
3. respiratory organs of insects
4. endocrine glands of insects
1. | urea | 2. | protein |
3. | ammonia | 4. | amino acid |
1. | 540 mL | 2. | 660 mL |
3. | 840 mL | 4. | 1040 mL |