Interdependence in nature
An excellent example of interdependence is the spider crab and algae. Spider crabs live in shallow areas of the ocean floor, and greenish-brown algae lives on the crabs' backs, making the crabs blend in with their environment, and unnoticeable to predators. The algae gets a good place to live, and the crab gets camouflage.
Hard to see but the picture is showing the spider crab in its camouflaged state.
The bee and the flower. Bees fly from flower to flower gathering nectar, which they make into food, benefiting the bees. When they land in a flower, the bees get some pollen on their hairy bodies, and when they land in the next flower, some of the pollen from the first one rubs off, pollinating the plant. In this interdependent relationship, the bees get to eat, and the flowering plants get to reproduce.