Mutualism is best described as

• A. One species benefits while the other is harmed.
• B. The interaction has no effect on either species.
• C. Both species are harmed.
• D. Both species benefit from the interaction.

Answer: (D)

Mutualism describes a relationship where both species benefit from each other, boosting each partner’s fitness. For example, bees get nectar from flowers, while flowers gain help with pollination. Clownfish find protection among sea anemones, and the anemones may benefit from cleaning and nutrient scraps the fish provide. In the human body, gut bacteria help digest food and produce vitamins, while we offer a stable habitat and resources. This is different from relationships where one species is harmed or where the effect on one is neutral.