Population ecology is the study of how populations — of plants, animals, and other organisms — change over time and space and interact with their environment. Populations are groups of ...

Genetic variation describes naturally occurring genetic differences among individuals of the same species. This variation permits flexibility and survival of a population in the face of changing ...

According to this idea, the changes leading to a new species don't usually occur in the mainstream population of an organism, where changes wouldn't endure because of so much interbreeding among ...

WEST LAFAYETTE, Ind. – Purdue University researchers have found that releasing a transgenic fish to the wild could damage native populations even to the point of extinction. A transgenic organism is ...

Make a model of a food web. Explain how changes in the population of one organism can affect the entire food web. Ask students to list several organisms found in the region. These should include ...

A fox is a predator, and a rabbit is its prey An owl is a predator, and a mouse is its prey An animal is often both a predator and prey The population or number of each organism in a food chain ...

Energy is lost to the surroundings from one level to the next, so there are usually fewer organisms at each level in this food chain. A lot of clover is needed to support the snail population.