Scientific study of all the interrelationships between organisms and their environment

Relatively thin layer of earth and its atmosphere that supports it

Any living factor in an organisms environment

Any non living factors in an organisms environment

Group of organisms of the same species that occupy the same geographic place at the same time

Group of interacting populations that live in the same geographic area at the same time

Biological community and all the living factors that affect it

Large group of ecosystems that share the same climate and have similar types of communities

Physical area where an organism lives

Role or position of an organism in it’s environment

Act of one organism feeding on other organisms

Close mutalistic parasitic or commensal

Symbiotic relationship in which both organisms benefit

Symbiotic relationships in which one organism benefits at the expense of another organism

Organism that captures energy from the sun

Organism that cannot make its own food

Heterotroph that only eats plants

Heterotroph that’s preys on other heterotrophs

Heterotroph that consumes both plants and animals

Heterotroph that decomposes organic material

Each step in the food chain or food web

Simplified model that shows a single path for energy flow through an ecosystem

Model that consists of many interconnected food chains and pathways

Total mass of living matter at each trophic level

Anything that takes up space and has mass

Chemical substances that living organisms obtain

Exchange of matter through the biosphere

Process in which nitrogen gas is captured and converted into a form plants can use

Nitrogen compounds converted back into nitrogen gas