You are presented with the question "What causes blood to thicken?" and the following answer choices: 
- Constriction
 - evaporation
 - heat or cold
 - thirst
 - permineralization
 - sweating
 - flow of electrons
 - matter vibrating

Now knowing that constriction occurs when the muscular walls of blood vessels contract and dehydration causes vessels to constrict and blood to thicken, choose the best answer.


 

 Constriction        