A population of frogs in a pond began with 67 individuals. Over one year, the population changed to 53. Which are two possible reasons for the change within the frog population?

emigration or increase in death rate
emigration or increase in birth rate
immigration or decrease in death rate
immigration or increase in birth rate

 emigration or increase in death rate

Explanation:

Many factors can modify the animal population in a specific area.

Amphibian populations are affected mostly by changes in temperatures, altered dry season rainfall, and modified leaf litter depth.

Considering the options provided, only emigration and an increase in death rate could explain the decrease of the frog population.

Immigration and an increased birth rate would result in the population growing, not decreasing.  

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