The relationships between a community of plants and animals and their environment are known as a(n)

Ecosystem

reason -

An ecosystem consists of both abiotic and  biotic components that interact with in themselves and the surrounding physical environment. All these components are interlinked and connected through various food , nutrient and energy cycle to maintain the stability with in the ecosystem. All elements and organisms are essential to the functioning of an ecosystem and none of them can be ignored or replaced with the other.

i think that is new experiments yield untrustworthy data and should be carefully considered, because you don't know what will happen with the experiments.

c is the correct answer hope this !