Unit 1 Test

Term Definition
Organism -a living thing
Habitat -an environment that provides everything a organism needs to live, grow, and reproduce
Biotic Factors -the living parts of a habitat
Abiotic Factors -the nonliving parts of a habitat
Photosynthesis -when plants and algae need water, sunlight, and carbon dioxide to make their food
Species -a group of organisms that are physically similar and can mate with each other and produce offspring
Population -all the members of one species in an area
Community -all the different populations that live together in an area
Ecosystem -a community of organisms that live in a particular area, and with their nonliving surroundings
Ecology -the study of how things live and interact with each other and with their environment
Estimate -an approximation of a number, based on reasonable assumptions
Birth Rate -the number of births in a population in a certain amount of time
Death Rate -the number of deaths in a population in a certain amount of time
Immigration -moving into of a population
Emigration -moving out of a population
Population Density -the number of individuals in an area of a specific size
Limiting Factor -an environmental factor that causes a population to decrease
Carrying Capacity -the largest population that an area can support
Natural Selection -a characteristic that makes an individual better suited to its environment and may become common through a process
Adaptations -the behaviors and physical characteristics that allow organisms to live successfully in it's environment
Niche -the role an organism plays in its habitat, or how it makes its living
Competition -the struggle for two organisms to survive as they attempt to use the same limited resource
Predation -an interaction in which one organism kills and eats another for food
Predator -the organism that does the killing
Prey -the organism that gets eaten
Symbiosis -a close relationship between two organisms that benefits at least one of the species
Mutualism -a relationship in which both organism benefits
Commensalism -a relationship in which one organism benefits while the other is unharmed
Parasitism -a relationship in which one organism benefits while the other is harmed
Parasite -the organism that benefits
Host -the organism that is harmed
Succession -a series of predicable events that occur in a community over time
Primary Succession -a series of changes that occur in an area where no organisms or soil exist
Pioneer Species -the populate in an area in area
Secondary Succession -a series of changes that occur where an ecosystem has been disturbed, but organisms and soil still exist
Environment -includes all the living and nonliving thins that affect life in an area

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