21. B
Explanation:
Death of predators would mean there would be nothing to control the repopulation of the mammals because there’s nothing to kill them off at the same rate they’re repopulating.
22. C
Step-by-step explanation:
If a natural disaster occurs this means resources for the mammals to continue to repopulate would also drop so they wouldn’t have enough materials to keep a steady or increased population
23. A
Explanation: if they were equal this would stabilize the population