Ascientist observes the population of two animals in a park. the number of animal a, a(t), is increasing over time. the number of animal b, b(t), is decreasing over time. drag each statement to show whether it is true, not true, or if it cannot be determined from the given information. math item stem image clear check the total number of animals increases over time. at 1 year, the total number of each species is the same. the function s(t) = a(t)  + b(t) tells you the total number of animal a and animal b in the park. you need to add because you are finding the total. the function s(t) = a(t)  − b(t) tells you the total number of animal a and animal b in the park. you need to subtract b(t) because its total number is decreasing. there is always more of animal a than animal b in the park at any point in time. the number of animal a is increasing at a faster rate than the number of animal b is decreasing.