Answer:
The Africanized bees deplete the resources native bees need to survive.
Step-by-step explanation:
The two bees species occupy the same niche and hence compete for resources. Because the Africanized bees are more aggressive, they have an advantage and therefore outcompete the native bees for the same resources. Therefore, over generations more Africanized bees are able to pass their genes to the next generation than native bees.