Suppose that scientists also studied a second population of belding’s ground squirrels from a different habitat. life table data for the first three years of this hypothetical population are shown below. (note that the table is not completely filled in because you will be calculating some of these values.) age (years) number alive at start of year proportion alive at start of year death rate average number of female offspring 0-1 80 1.000 0.00 1-2 64 ? 1.20 2-3 40 2.40 which equation determines the proportion of ground squirrels alive at the start of year 1-2? (this value is marked with a "? " in the table.) 40/64 = 0.625 (80-64)/80 = 0.200 64/80 = 0.800 (80-64)/64 = 0.250