Answer:
An increase in a population of one species may case the extension of another species with the same food ration.
An introduction of a new food resource into the environment may cause a new species to appear.
An introduction of a new species of predator may cause the evolution of new defenses in some prey species.
Explanation:
An increase in a population of one species causes the extension of another species with the same food preference because the high population specie eat all the food and no food source is available to the other organism. An introduction of a new food resource into the environment may cause a new species to appear due to availability of the type of food.. An introduction of a new species of predator may cause the evolution of new defenses in some prey species which helps them in their survival.