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Ecology
Ecology is the branch of biology that deals with the relations of organism to one another and to their physical surroundings and habitat. It relates to how these organisms interact and depend upon...
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Cycles of Matter
Hydrologic Cycle: The sequence of conditions through which water passes from vapor in the atmosphere through precipitation upon land or water and back into the atmosphere. Carbon Cycle: The series of....
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Succession
Ecological Succession : An observed change over time in a number or type of species in an ecosystem. Primary Succession : The series of changes that occur where there is no soil or organisms....
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Biotic Interactions
Competition: The activity or condition of competing for a resource. Predation: The preying of one animal on others. Symbiosis: Interaction between two different organisms living in close...
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Levels of Organization
Organism: An individual animal, plant, or single-celled life form. Population: A particular section, group, or type of organisms living in an area or region. Community: A group of organisms living in....
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Limiting Factors
Food: Any nutritious substance that people or animals eat or drink, or that plants absorb, in order to maintain life and growth. Shelter: A place giving temporary protection from bad weather or...