Think about the meanings of the words "dependent" and "independent" as they relate two variables. What do you think "interdependence" means in terms of organisms that live together in an ecosystem?
Interdependance could mean how the two organisms are two different living things that work in different ways to eachother, yet because of the fact they live together in an ecosystem states the fact they work together to help that ecosystem thrive.
(This is my interpretation, feel free to copy and paste as your answer :))
