Students learn about population density within environments and ecosystems. They determine the density of a population and think about why population density and distribution information is useful to engineers for city planning and...

In this lesson, students compare various types of relationships among organisms (i.e., biotic interactions). Students will: explain the roles of producers and consumers, and predators and prey in an ecosystem. Explain the levels of order...

Review the relationship between populations and ecosystems.

This short video explains how warmer temperatures in the Arctic are transforming the ecosystem and affecting the Athabaskan people, threatening their way of life. [2:59]

Learn about the effects of alien species on native environments and explore biologists' use of capture/recapture statistics and analysis of sampling techniques by estimating the population size of a tagged species.

Explore biotic and abiotic factors that can influence the growth of populations of organisms in this interactive tutorial.

A simulator reviewing over the concepts of ecosystem equilibrium.

[Free Registration/Login may be required to access all resource tools.] Summarizes the key points about the evolution of agriculture and how it has impacted human population growth. Includes a few questions to check for understanding.

Examine the relationship between the island fox and golden eagle populations on Santa Cruz Island over a twelve-year period using the TI-73 Explorer to graph and analyze the values.

Abiotic factors vary in the environment and determining the types and numbers of organisms that exist in that environment. Factors which determine the types and numbers of organisms of a species in an ecosystem are called limiting...

Describes six levels of organization in the biological world - individual species, population, community, ecosystem, biome, and biosphere.

A collection of video lectures introducing beginning biology students to the principles of evolution, ecology, and behavior. The course was taught three times a week for a semester at Yale University. The course discusses concepts of...

In this video profile produced for Teachers' Domain, meet La'ona DeWilde, an environmental biologist who integrates her Athabascan heritage and her Western scientific training to help remote Alaskan villages address environmental issues.

A complete look at the continent of Antarctica. You can view pictures, utilize a fact file index, and get a historical timeline.

In this What's Up in the Environment? video segment, learn how various indicator species are used to monitor the environmental condition of the Everglades.

A suite of lessons focusing on the process of upwelling. Inquiry-based exploration of seasonal upwelling includes marine food webs, food production in the ocean, wind-driven ocean currents, and seasonal changes in biotic and abiotic...