AP BIOLOGY

Detailed explanation-1: -In the natural world, limiting factors like the availability of food, water, shelter and space can change animal and plant populations.

Detailed explanation-2: -Immigration is the permanent inward movement of some individuals coming from outside into an existing population. This increases population density and would not limits growth.

Detailed explanation-3: -Thus, organisms tend to compete for their limited availability in the ecosystem. Different limiting factors affect the ecosystem. They are (1) keystone species, (2) predators, (3) energy, (4) available space, and (5) food supply.

Detailed explanation-4: -Limiting factors are things that can limit the size of a population such as food, water, shelter, disease, nesting sites, predation, and parasitism.