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Levels of Organization
Organism Interactions
Population Dynamics
Food Chains and Webs
Biogeochemical Cycles
100

The level of organization that includes one individual of a species.

Organism

100

One organism benefits, the other is actively harmed.

Parasitism

100

Two factors that can increase population density.

Birth rate (natality)

Immigration

100

Organisms that make their own food.

Producers

100

The main way that humans contribute to increasing levels of carbon dioxide in the atmosphere.

Burning fossil fuels, combustion.

200

Many organisms of the same species.

Population

200

Both organisms benefit

Mutualism

200

Two factors that can decrease population density.

Death rate.

Emigration

200

Organisms that need to eat other things for food.

Consumers

200

The process by which plants capture CO2 from the atmosphere and convert it into sugars like glucose.

Photosynthesis.

300
Many organisms of different species.

Community

300

One organism benefits, the other experiences no effect at all.

Commensalism

300

One example of density-dependent limiting factors.

Competition, Predation, Parasitism, Disease

300

Organisms that break down dead stuff

Decomposers

300

The process by which CO2 is released into the atmosphere as a waste product of metabolism.

Cellular Respiration

400

Many organisms of different species and the abiotic factors of the environment where they live. 

Ecosystem
400

One animal hunts and kills another for food.

Predation

400

One example of density-independent limiting factors.

Weather changes, pollution, natural disasters

400

The trophic level that eats the producers in an ecosystem (1, 2, 3, etc) 

2 - Primary Consumers

400

How carbon is returned to the soil at the end of its cycle.

Decomposition

500

A large naturally occurring collection of biotic and abiotic factors that occupy a major, regional habitat.

Biome

500

A relationship that exists between two or more organisms that are fighting for the same limited resource. 

Bonus: Define interspecific and intraspecific.

Competition

500

The type of growth that most populations experience due to the existence of carrying capacity.

Logistic

500
The reason why communities can only sustain 4-5 trophic levels.

A very small fraction of the energy created by producers reaches the top levels of the pyramid. There is not enough energy to sustain higher levels because of metabolic demands.

500

Two factors (one biotic and one abiotic) that contribute to nitrogen fixation

Bacteria and lightning