Levels of Organization
The level of organization that includes one individual of a species.
Organism
One organism benefits, the other is actively harmed.
Parasitism
Two factors that can increase population density.
Birth rate (natality)
Immigration
Organisms that make their own food.
Producers
The main way that humans contribute to increasing levels of carbon dioxide in the atmosphere.
Burning fossil fuels, combustion.
Many organisms of the same species.
Population
Both organisms benefit
Mutualism
Two factors that can decrease population density.
Death rate.
Emigration
Organisms that need to eat other things for food.
Consumers
The process by which plants capture CO2 from the atmosphere and convert it into sugars like glucose.
Photosynthesis.
Community
One organism benefits, the other experiences no effect at all.
Commensalism
One example of density-dependent limiting factors.
Competition, Predation, Parasitism, Disease
Organisms that break down dead stuff
Decomposers
The process by which CO2 is released into the atmosphere as a waste product of metabolism.
Cellular Respiration
Many organisms of different species and the abiotic factors of the environment where they live.
One animal hunts and kills another for food.
Predation
One example of density-independent limiting factors.
Weather changes, pollution, natural disasters
The trophic level that eats the producers in an ecosystem (1, 2, 3, etc)
2 - Primary Consumers
How carbon is returned to the soil at the end of its cycle.
Decomposition
A large naturally occurring collection of biotic and abiotic factors that occupy a major, regional habitat.
Biome
A relationship that exists between two or more organisms that are fighting for the same limited resource.
Bonus: Define interspecific and intraspecific.
Competition
The type of growth that most populations experience due to the existence of carrying capacity.
Logistic
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.
Two factors (one biotic and one abiotic) that contribute to nitrogen fixation
Bacteria and lightning