Answer:
Natural selection will occur because there is competition
Step-by-step explanation:
Why?
The amount of individuals in the population cannot be fully supported by the ecosystem. This will lead to the dying out of members of the population. Factors like food, habitat, ETC. could be limited in this circumstance. This will cause competition between individuals of the population to stay alive.
The individual that is better at gathering food will stay alive, whereas the individual that isn't as good at gathering food will likely perish due to their inability to feed itself.
You could say there is natural selection for the individuals that gather food better than others.
Competition arises in a population that cannot support all of it's members.