Populations and Communities Table of Contents Living Things and the Environment Populations Interactions Among Living Things Changes in Communities

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.

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.

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.

Changes in Communities Primary Succession Primary succession occurs in an area where no soil and no organisms exist.

Changes in Communities Secondary Succession Secondary succession occurs following a disturbance to an ecosystem, such as clearing a forest for farmland.

Changes in Communities Comparison of Primary and Secondary Succession Based on the information given, what facts would complete this table?