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Chapter 2


Ecologists study feeding patterns to learn how energy flows within an ________________.


Organisms that use the sun's energy to turn water and carbon dioxide into food molecules.

energy pyramid

A diagram that shows the amount of energy that moves from one feeding level to another in an ecosystem.

water cycle

The process of evaporation, condensation, precipitation.

nitrogen fixation

"Free" nitrogen gas is changed into a usable form of nitrogen in this process.


Wind, water, and living things are 3 ways to do this.

climate conditions

The type of biome that exists in an area is determined by __________.


The biome which received less than 25 centimeters of precipitation a year.


An extremely cold, dry land biome.


Succession in the series of predictable changed that occur over time in a _________________.


A carnivore that feeds on the bodies of dead organisms.


Plants, algae, and some microorganisms make food molecules in this process.

continental drift

The very slow motion of huge blocks of Earth's crust.


Physical barriers, competition, and climate conditions can limit the _______ of species.


A group of ecosystems with similar climates and organisms.


Breaks down wasted and dead organisms and return raw materials to the environment.


This is NOT recycled in ecosystems.

native species

Species that have naturally evolved in an area.


The study of where organisms live.


Wolves, foxes, caribou, and reindeer art typical animals in this biome.

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