Question Detail
Question
A facultative positive-positive (+/+) interaction is: A. neutralism B. protocooperation C. commensalism D. amensalism
Correct Answer
Option B is the correct answer.
Detailed Explanation
A positive-positive (beneficial to both) interaction that is facultative (not obligatory; the species can survive without it) is called protocooperation. An example is the relationship between birds that feed on insects stirred up by grazing cattle.
Hint
Both benefit, but they don't absolutely depend on each other.