Which factor affects the same percentage of a population regardless of the population's density?

Answer;

Flood

Explanation; Flood is an example of a density-independent factor and thus could affect the same percentage of a population regardless of the population's density. Density-independent factors affects the population size no matter what is the density of the population like weather and climate. Density-independent factors include; weather and climate, they exert their influences on population size regardless of the population's density. In contrast, the effects of density-dependent factors intensify as the population increases in size.

The factor which affects the same percentage of a population is Flood

Explanation:

A flood is an overflow of water on land which is usually dry. Sometimes a water resource such as river, lake or pond gets flushed with too much water and sometimes heavy rains cause floods and devastate the population. The same percentage of a population regardless of the population's density is affected by the flood no matter what is the density of the population.