Fact 1: Animals require water for survival.

Fact 2: Water fills the oceans of the world up to sea-level making it a liquid, a type of fluid.

Given the two facts above, answer the question "What requires a type of fluid to survive?" with the following options: 
- snail
 - wind
 - tapeworms
 - mussels
 - stones
 - animals
 - sand
 - Nematoda


 

      animals   