@PetraPhoenix I think that petrol is mostly made up of *plants* that coexisted with dinosaurs, so the problem isn't really relevant.although, some plants do get their nutrients from decomposed animal carcasses, so some dead animals are still involved?I guess most of those animals died of natural causes, but then some may have also been killed by predators, and I don't know how that part countsam I overthinking a question posed by an 8 year child?