An example that shows how organisms are dependent on each other would using a food chain as an example. • mouse eat grass and drink water ( which is nonliving) • mouse gets eaten by fox • then fox then eaten by coyote and the cycle continues However is one of these organisms have low population it will be difficult for the others. For example if there is a low population of coyotes then the fox population over populate same goes for if fox are low in population then the mouses become over populated hence diseases could spread from the mouses. The organisms must keep each other in check
Well fossil fuels are a finite resource and at the rate we are using them, yes they will run out. but not anytime soon. but yes. we use them faster than they can be created. they WILL run out eventually.