What is the relationship between elements of an ecosystem

Forests provide excellent introductions to the foundational concepts of ecology, since they are among the most structurally and biologically diverse of the planet’s ecosystems.

The oppositional relationships are predation and competition. The symbiotic relationships are mutualism, commensalism, amensalism, and parasitism. The ecological relationship an organism has depends on the way the organism adapted to its environmental pressures on evolutionary bases. I hope that helps!

Do you have a picture for this problem?

Why you put last one a? i think is b.