Populations and Communities Table of Contents Living Things and the Environment Energy Flow In Ecosystems Interactions Among Living Things Populations

Living Things and the Environment Factors in a Prairie Habitat A prairie dog interacts with many biotic and abiotic factors in the prairie habitat.

Living Things and the Environment Biotic and Abiotic Factors Salt is an abiotic factor found in some environments. To see how the amount of salt affects the hatching of brine shrimp eggs, varying amounts of salt were added to four different 500-mL beakers.

Living Things and the Environment Ecological Organization The smallest level of organization is the organism. The largest is the entire ecosystem.

Energy Flow in Ecosystems What Happened Here? While you were hiking, some hungry animals turned your campsite upside down.

Energy Flow in Ecosystems What Happened Here? Can you determine the order in which the organisms visited the campsite?

Energy Flow in Ecosystems Food Web A food web consists of many interconnected food chains.

Energy Flow in Ecosystems Energy Pyramids Suppose that the producers at the base of an energy pyramid contain 330,000 kilocalories. How much energy would be available at each level of the pyramid?

Interactions Among Living Things Saguaro Community Look for examples of how organisms interact in this scene.

Interactions Among Living Things Niches Organisms occupy many niches in an environment.

Interactions Among Living Things Predator-Prey Interactions On Isle Royale, an island in Lake Superior, the populations of wolves (the predator) and moose (the prey) rise and fall in cycles.

Interactions Among Living Things List the names of the parasites and the hosts.

Populations Population Size Using the data table, create a double bar graph showing alligator births and deaths for four years.

Populations Changes in a Rabbit Population This graph shows how the size of a rabbit population changed over ten years.

Populations Population Density of the Flamingos in the Pond In the pond on the top, there are 10 flamingos in 8 square meters. The population density is 1.25 flamingos per square meter.

Populations Relate Cause and Effect As you read about the four factors that can limit populations, think about cause and effect.