- Nitrogen
- Helium
- Hydrogen
- Hydrogen sulphide
- 2
- 4
- 6
- 8
- Carbon monoxide
- Methene
- Oxygen
- Nitrogen dioxide
- only once
- only few times
- again and again
- non of above
- Earthworm
- Cockroach
- Hydra
- Sponges
- Molluscs
- Annelids
- Sponges
- Cniderians
- Beri-Beri
- Architis
- Scurvy
- Night-blindness
- Chromo-proteins
- Lipo-proteins
- Phospho-proteins
- Nucleo-proteins