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, what requires a type of fluid to survive?

Select from:
 a). snail.
 b). wind.
 c). tapeworms.
 d). mussels.
 e). stones.
 f). animals.
 g). sand.
 h). Nematoda.
Answer:
f).