A fight between a family of lions and family of hyenas over an animal carcass would be best described as competition between

a community and an ecosystem.

a population and a community.

two different populations.

two different communities

The answer is two different populations.

Competition is an interaction between populations in which they compete for limited resources. Here we have two populations - a population of lions and a population of hyenas. If resources (water, sunlight, territory, food, in this example, an animal carcass) are limited and several populations depend on these resources, then, they must compete to gain the resources.