Pls help me ppls

because teh aligator population decreased, there will be less gar predators, thus increasing gar population. the crab's predator, the gar, causes the crab population to decrease, because more gars equals more crab to be eaten

hence the crab population decreased. because there's less duck predator, duck population explode in number

Explanation:

hope this'll explain:)

a. competition with other nations.

entering that problem on the tube you may come up with an answer