How do the equilibrium population sizes change as a increases? Question 3 options: A) As a increases, the equilibrium population size continuously decreases for the moths, but for the cacti it first increases and then decreases. B) Up to somewhere between a = 0.3 to 0.4, populations go extinct, but between a = 0.4 to almost 0.6 they converge on a joint equilibrium. C) As a increases, the equilibrium population size continuously decreases for both the moths and the cacti. D) A and B are correct. E) B and C are correct