There are 35 chipping sparrows and 40 cowbirds in a forest. Female cowbirds are parasites to other bird species like the chipping sparrows. If the chipping sparrow population size suddenly decreased to 15, how would it affect the size of the cowbird population? A. The cowbird population would increase. B. The cowbird population would decrease. C. The cowbird population would go extinct. D. The cowbird population would stay the same.