Concept:Population interactions describe the relationship between two species living in the same community.Key Fact:Different interactions have distinct outcomes: mutualism (+,+), commensalism (+,0), parasitism (+,−), amensalism (−,0).Explanation:Statement A is wrong because commensalism benefits one species but does not harm the other – it remains unaffected.Statement B is correct: mutualism benefits both species.Statement C is wrong: commensalism benefits only one species, not both.Statement D is correct: parasitism benefits the parasite and harms the host.Statement E is correct: amensalism harms one species while the other is unaffected.Answer:B, D and E only.
