Answer:
C. a crab finding a new home between rocks in a tidepool.
Explanation:
A. Small fishes are living organisms, and seaweed is also a living organism.
B. A tiny fish is a living organism, and plants are also living organisms.
C. A crab is a living organism, while a rock is a non-living thing.
D. Both rocks and sand are non-living things.
Therefore, our final answer would be C.
Hope this helps!
