Replace the question mark with an option that follows the same logic applied in the first pair.
Immunology ∶ Immune system ∶∶ Hydrology ∶ ?
1
Plants
2
Water
3
Fire
4
Fish
Replace the question mark with an option that follows the same logic applied in the first pair.
Immunology ∶ Immune system ∶∶ Hydrology ∶ ?