Fact 1: Mollusks live in most terrestrial, freshwater, and marine habitats.

Fact 2: Clams are mollusks that live in the sea or in freshwater.

Given the two facts above, answer the question "what lives in most terrestrial, freshwater, and marine habitats" with the following options: 
- Birds
 - humans
 - clams
 - sharks
 - life
 - ecosystem
 - amoeba
 - edible


 

   clams      