What do parasitism, predation, and commensalism have in common? how are they different?

Symbiosis is the ecological relationship between two or more organisms living closely together with some form of feeding relationship involved. There are three main symbiotic relationships. Mutualism, where both organisms benefit. Commensalism, where one organism benefits while the other organism is not harmed or helped. Parasitism, where one organism is harmed but not killed automatically and the other is benefited. 

Explanation:

edge 2020

feral cats are estimated to eat tens of millions of native animals each night in australia

kelp are large brown algae that live in cool, relatively shallow waters close to the shore. they grow in dense groupings much like a forest on land. these underwater towers of kelp provide food and shelter for thousands of fish, invertebrates, and marine mammal species.

e) all of the above