First slide
Populations
Question

In which of the following population interactions, one of the species is neither benefited nor harmed?

Moderate
Solution

In both commensalism and amensalism, one of the interacting species remains neutral (it is neither benefited not harmed). 

The interaction where one species is benefitted and the other is neither benefitted nor harmed is called commensalism. In amensalism on
the other hand one species is harmed whereas the other is unaffected.

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