Which of the following determines the sucess or failure of a species

D. All of the above.

If the rate of reproduction were to come to a halt, the species would begin to die out, especially if it didn't begin to regulate once again.

The amount of food supply is vital for a species to survive, as anything can die of starvation.

If there are more natural enemies than there are the said species in the habitat, the species will not survive as they will be hunted.

hope this helps!

every el niño cycle is different. every year.