Which factor most likely caused the non croaking male population to increase after 2004

 Increased population results to increased rate at which resources are consumed. This is because,   more resources will be required to support   population growth and therefore depletion of resources tend to be more rampant when population becomes high. This is the reason behind population control so as to ensure resources are not fully depleted  due to increase in  population.

Explanation:

Selective pressure in the form of a new predator

Explanation:

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answer; /// the above statement is (true);