So, a sudden drop in the death rate means that while everything stays the same, less penguins are dying: the penguins are living longer! This means that the population will increase: there will be more penguins at all times!
Population density can be define as the measurement of a population of a species per unit area. It is influence by death rate, birth rate, immigration and emigration.
Death rate or mortality rate can be define as the number of deaths in a particular area in a particular period of time. It can be also define as the ratio of deaths to per thousand individuals in an area.
According to the given situation, a drop in the death rate will result in less number of deaths of penguins in antarctic region. As less number of penguins dye the overall population density will remain unaffected. Hence, the population growth will remain constant.
