Which of the following is an example of mutualism?

• A. Bees pollinating flowers while collecting nectar
• B. Barnacles attaching to a whale for transportation
• C. A bird nesting in a tree without affecting the tree
• D. A tapeworm living in the intestines of a mammal

Answer: (A)

Verified step by step guidance

1. Define mutualism: Mutualism is a type of symbiotic relationship where both organisms involved benefit from the interaction.
2. Analyze the first option: Bees pollinating flowers while collecting nectar. Bees benefit by obtaining nectar as a food source, and flowers benefit because pollination helps them reproduce. This is an example of mutualism.
3. Analyze the second option: Barnacles attaching to a whale for transportation. Barnacles benefit by gaining mobility and access to food, but the whale is neither harmed nor benefited. This is an example of commensalism, not mutualism.
4. Analyze the third option: A bird nesting in a tree without affecting the tree. The bird benefits by having a safe place to nest, but the tree is unaffected. This is another example of commensalism, not mutualism.
5. Analyze the fourth option: A tapeworm living in the intestines of a mammal. The tapeworm benefits by absorbing nutrients from the mammal, but the mammal is harmed. This is an example of parasitism, not mutualism.