Answer: The other population will decrease.
Step-by-step explanation: The blue jays and crow eat caterpillar and mice as their food so there number will be significantly maintained in the environment.
If the population of Blue jays increases then rest other population will decrease, as the number of caterpillar and mice will decrease.
As their number will decrease, there will be more competition and less food will be available for the crow.
So, the population of crow will also decrease.