A duck population normally begin migrating south right after the last rain of the late summer season. Suddenly, they’re migrating much earlier. The climate has been changing far too often which is altering the effects of their magnetite.

One of the wolf populations begins to compete with a new bear population for the same herbivores. Over time, bushes, trees and rivers improve in numbers. There is an effect on the producer populations. What is the limiting factor to the herbivore?

Small krill sweep the river bottom rocks for debris and muck. Next, the krill is suddenly swooped up by a small fish. The small fish then gets eaten by a salmon. A week after the bear eats the salmon, it begins to have symptoms. Over time the bear weakens from a botfly infection. What is the limiting factor to all the consumers?

A honey-badger digs the ground tunnels in search for snakes. In one occasion, the badger finds a snake and competes with it. The badger leaves scratches and bite marks on the snake before it escapes. After twenty-four hours the snake dies. What is the limiting factor to the snake?

The wolf population gets reintroduced to the ecosystem. There is enough deer to go around, so they eat comfortably. The wolf population begins to grow out of control with so much food. The different wolf families then begin to compete for the few caves that exist. Not everyone has good shelter so some have to sleep in the forest floors. What is the limiting factor to the wolves?

The wolf goes extinct, and the deer population has no predator to worry about. They graze the land. Because there is no more food. Some of the deer begin to bite at each other, while others die of starvation. What is the limiting factor to the deep population?

A landslide covers the river’s path. Further downstream, water depletes and fish populations start to go down. In this case the landslide was a limiting factor.

A random cloud forms and fills the rivers with excess water. In one lake biome, the excess rain pulls trees into rivers destroying bird shelters. What is the limiting factor to the biome?

Which of these factors do not respond to the density of a population in an ecosystem?

Which of these limiting factors has an influence on the growth of a population based on its density?

A student brings home a bull toad from the Amazon in Brazil. It gets fat and ugly so he tosses it in the river. This toad starts competing with local toads for their food, shelter, and space. What kind of limiting factor best represents what happened to the local toads?

Which of these has the greatest effect on the population of moose?