Answer: Lake.
Explanation:
Colonial protists are unicellular protists that form colony together like green algae or slime molds live in wet or moist areas. They live in fresh water or wet environment because they need water to live. They need water for their metabolism, reproduction and they lack special organelles such as red blood cells to meet their oxygen level, living in water will help them to get little oxygen they need. Water is essential for their living and even feeding.
