Complete the sentence. Commensalism is best defined as .
Select one:

a relationship in which both species benefit from the relationship

a relationship in which only one organism benefits and the other is neither helped nor harmed

an organism killing another organism for food

a relationship in which one organism benefits by living in or on another and the other organism is harmed

a relationship between two organisms of different species. In a commensal relationship, one organism benefits while the other is generally unaffected.

a mid-ocean ridge or mid-oceanic ridge is an underwater mountain range, formed by plate tectonics. this uplifting of the ocean floor occurs when convection currents rise in the mantle beneath the oceanic crust and create magma where two tectonic plates meet at a divergent boundary.a geomagnetic reversal is a change in a planet's magnetic field such that the positions of magnetic north and magnetic south are interchanged.