A marsh has sufficient food to sustain no more than 50 adult mallards and 250 mallard
ducklings. There’s no brood cover, and any ducklings on the marsh are soon killed by predators.
Adult mallards on the marsh are never killed by predators.Which of the following is
correct about this marsh?
A. Its carrying capacity is 50 mallards.
B. Its carrying capacity is 300 mallards.
C. Its limiting factor for adult mallards is cover from predators.
D. Its carrying capacity can be increased by erecting nesting cones.