- Statement 2 is incorrect: Competition is a type of negative interaction in a biotic community, where both species involved are harmed or negatively affected (-/-). - Statement 3 is correct: Protocooperation (also known as facultative mutualism) is a type of positive interaction where both species benefit (+/+), but the interaction is not essential for their survival. - Statement 1 (Colonisation) is less definitively classified as a type of interspecific interaction in the same way as competition or mutualism. However, colonisation is a crucial ecological process. In the context of community dynamics and succession, colonisation can involve positive interactions (e.g., facilitation, where early colonizers modify the environment positively for later species). Given that option D includes both 1 and 3 and excludes the incorrect option 2, it suggests that 'Colonisation' is considered a type of positive interaction in this context, perhaps referring to the positive impact or facilitation aspects associated with the establishment of new species in a community.