Pisaster ochraceus is a starfish predator that balances the ecosystem in intertidal pools. If you wanted to predict the population size of the starfish in six months (n), and you had the growth rate (r), what additional factor would you MOST LIKELY need?

A. Initial population because you can apply the formula P(n) = Norn
B. Final population because you can apply the formula P(n) = Norn
C. Maxima population because you can apply the formula P(n) = Norn
D. Minima population because you can apply the formula P(n) = Norn

B. Final population because you can apply the formula P(n) = Norn

In order to predict the population size of the starfish in six months using the growth rate, you would need to know the current population size (N) to calculate the final population (P) after six months using the formula P(n) = Norn. Without knowing the initial or final population size, it would be impossible to accurately predict the population size in six months.