The monarch butterfly feeds on milk-weed to obtain nectar. while visiting the flower, the butterfly may incidentally pick up pollen on its leg and carry the pollen to other milk-weed plants, aiding in cross-pollination. this relationship is best described as:

mutualism

Explanation:

Mutualism is a type of symbiotic relationship which involves the interaction of two different species of organisms interacting together to benefit from each other. In mutualistic relationship, both organisms involved depend on each other for nutrition, protection, reproduction or survival.

Mutualistic relationship can be seen between plant pollinators and flowering plants. The Monarch butterfly as a plant pollinator, depends on the milk-weed plant for nectar, while it helps the milk-weed plant in cross-pollination. Both organisms benefit from mutualism.

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