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Ch 5 science

How Ecosystems Work

The process by which plants,algea,and some bacteria use sunlight, carbon dioxide, and water to produce carbohydrates and oxygen. photosynthesis
an organism that makes its own food. also called autotrophs = self feeder. producer
organisms that get their energy by eating other organisms. also called heterotrophs = other feeders. consumer
consumers who get their food by breaking down other organisms, bacteria & fungi. decomposer
the process of breaking down food to yeild energy. cellular respiration
a sequence in which energy is transfered from one organism to the next as each organism eats another organism food chain
a diagram that shows the feeding relationships between organisms in a ecosystem. food web
one of the steps in a food chain or food pyramid trophic level
energy rich sugar molecules that organisms use to carry out daily activities, stored solar energy carbohydrates
plant eaters. herbivore
flesh eaters carnivores
eats both plans and animals omnivores
a process by which carbon is cycled between the atmosphere,land,water, and organisms carbon cycle
organisms that fix, or alter, atmosphereic nitrogen into chemical compounds that can be used by other organisms nitrogen-fixing bacteria
a process in which nitrogen is cycled between the atmosphere,bacteria,and other organisms nitrgoen cycle
the movement of phosphorus from the enviroment to organisms and then back to the enviroment phosphorus cycle
primary greenhouse gas Co2
producers to consumers short term carbon cycle
carbon becomes carbonats,becomes lime stone. Carbon in dead organisms can form coal,oil,and natural gas (fossil feul) long term carbon cycle
a gradual process of change and replacement of the types of species in a community ecological succesion
a type of succession that occurs on a surface where no ecosystem exsisted before primary succession
the more common type of succesion,occurs on a surface where an ecosystem has previously exsisted secondary succesion
the first organisms to colonize any newly avalible area and begin the process of ecological succession pioneer species
a final and stanle community climax community
are important early pioneers in primary succesion. they break down rock and contribute to soil development lichens