I’m not sure what you mean by “grow exponentially” here—they certainly can’t add dimension or number of live cells exponentially with respect to time; dimension is only ever added one cell per time-slice and is thus O(n) while number of cells contained within the maximum dimensions is O(n^2) and thus so is the number of live cells.
I’m not sure what you mean by “grow exponentially” here—they certainly can’t add dimension or number of live cells exponentially with respect to time; dimension is only ever added one cell per time-slice and is thus O(n) while number of cells contained within the maximum dimensions is O(n^2) and thus so is the number of live cells.