In a typical population of gazelle, the average birth rate is 25 new fawns each spring. however, this spring there was a significant increase in the amount of fawns birthed to 150. this drastic increase led to food being depleted, an overproduction of waste, and many in the population died as a result. which condition for natural selection was at work in this case? a) inherited variation b) mutation c) overproduction of offspring d) evolution