Answer: (harmful)
-Sometimes only one organism or species benefits from an interaction at the expense of another organism or species. This type of negative ecological interaction can come in different forms, such as predation or competition. ...
-Parasitism. ...
-Predation. ...
-Interspecific Competition.
Explanation: (helpful)
They include the provision of food, habitat, and more specialized services such as pollination, dispersal, predator defense, and reduction of physical stress. There are two types of positive interactions, mutualisms and commensalisms