Mutualism may be best defined as ........

Environment and Ecology Concept of Ecology

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Mutualism may be best defined as:

a relationship between two species which affects both in a positive manner.

a relationship between two symbionts

a relationship which is favourable to both but not obligatory

a relationship which is favourable to both and obligatory

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Explanation:

Mutualism might be obligatory or not.

In obligate mutualism the relationship between two species, in which both are completely dependent on each other.

Facultative mutualists are ones whose populations persist in the absence of a mutualist, whereas obligate mutualists are ones whose populations go extinct in the absence of a mutualist.

Symbiosis involves two species living in close physical contact over a long period of their existence and may be mutualistic, parasitic, or commensal , so symbiotic relationships are not always mutualistic, and mutualistic interactions are not always symbiotic.

so , answer is option 1