Answer:
1. A
2. D
Step-by-step explanation:
1. If a population is left unrestricted, meaning it is not limited to anything, then the population will continue to increase exponentially due to there being no limits.
2. If a population is limited, and it has reached its carrying capacity, then the essential needs of life are being competed for. Things like food, shelter, and mates are now a limited resource, and hence the option would be "all of the above".