Select the positive ecological interactions between organisms.

In ecology, positive interactions between organisms refer to relationships that benefit at least one organism without harming the other, or that benefit both organisms involved.

Commensalism is a type of interaction where one organism benefits while the other is neither helped nor harmed. For example, barnacles attaching to a whale can provide the barnacles with a place to live and access to nutrients without affecting the whale.

Mutualism is another interaction that is inherently positive for both organisms involved. In mutualistic relationships, both species benefit, such as bees pollinating flowers while feeding on their nectar. This interaction not only aids the survival of the bees by providing food but also helps the plants with reproduction.

Considering both commensalism and mutualism contribute positively to ecological interactions, selecting the combination of these two types is correct. Thus, the choice indicating both commensalism and mutualism as positive interactions accurately reflects the nature of these relationships within ecological systems.