Predation is a density-dependent factor, meaning that the impact of predators on a population depends on the density of the population.

Natural disasters can have a variety of negative impacts on populations, including direct mortality, habitat destruction, and disruption of food chains.

Drought, extreme heat, and frost can all have negative impacts on plant populations by causing stress, reducing growth, and increasing mortality.

Extreme weather events can have a variety of negative impacts on animal populations, including direct mortality, habitat destruction, and disruption of food chains.

War, disease, and famine are all examples of density-independent factors that can have a negative impact on human populations.

The key difference between density-independent and density-dependent factors is that density-independent factors affect populations regardless of their density, while density-dependent factors affect populations only when they reach a certain density.

Predation is a density-dependent factor because the impact of predators on a population depends on the density of the population.

Competition for resources can have a variety of negative impacts on populations, including reducing growth rates, increasing mortality rates, and leading to territorial behavior.

Competition for water and nutrients is a density-dependent factor that can affect plant populations because the more plants there are, the more competition there is for these resources.

Territorial behavior can have a variety of positive impacts on populations, including reducing competition for resources, helping to maintain a stable population size, and preventing the spread of disease.

Predation is a density-dependent factor because the impact of predators on a population depends on the density of the population.

Predation can have a variety of negative impacts on populations, including reducing growth rates, increasing mortality rates, and leading to changes in behavior.

War, disease, and famine are all examples of density-dependent factors that can have a negative impact on human populations.

Density-dependent factors can regulate population size by increasing mortality rates, reducing growth rates, and causing emigration.

Drought, extreme heat, and frost are all examples of density-independent factors that can have a negative impact on both plant and animal populations.