What are the characteristics that define populations? What causes populations to grow or decline? In the following video you will learn how a population is a group of individuals of the same species living within a designated area at one...

Population ecology is the study of groups within a species that interact mostly with each other. It examines how these animals live together in one geographic area to understand why these populations are different in one time and place...

As our planet has coughed up new oceanic islands and ripped its land masses apart, organisms have found themselves stranded in new environments. And every time, evolution has helped them adapt. [1:50] Play the Evolution Lab:...

Paul Andersen explains how populations interact in an ecosystem. The symbiosis of several populations is based on effects that may be neutral, positive, or negative. Interactions like mutualism, commensalism and parasitism are included....

Paul Andersen shows you how we can use a spreadsheet to model population changes. He begins with a brief discussion of populations and life cycles. He then shows you how you can model a single generation using a spreadsheet.

Discover the difference between a sample and a population and how they are used in surveys. Assess learning with a quiz. [2:26]