there are these things called survivorship curves and there are three types Type I (shown in red) Type II (blue) and Type III (green) They’re created by looking at birth and death rates of a given species and the curve shows at what point in time an organism of a specific species will die. For example, humans have a fairly low infant mortality and if you make it to around age 16 you’ll probably survive until you’re around 75 unless there’s an accident or you have some undetected disease that would cause you to die early. Type III are plants, fish, and other marine animals that have a very low chance of survival at birth but if they make it past infancy they will likely live to their life expectancy. Type II are birds, small lizards and mammals and they really just die randomly.