Question Detail
Question
+/+ interaction that is not obligatory is
Correct Answer
Option B is the correct answer.
Detailed Explanation
A +/+ interaction means both species benefit. In mutualism, the relationship is obligatory for survival (e.g., lichens). In protocooperation, both species benefit, but the relationship is not essential for their survival (e.g., cattle egrets and cows).
Hint
Which beneficial relationship is optional, not necessary for survival?