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Chapter 1

Populations and Communities

Organism A living thing
Habitat An environment that provides the things an organism needs to live, grow, and reproduce
Biotic Factors The living parts of a habitat
Abiotic Factors The nonliving parts of a habitat
Photosynthesis The process in which plants and algae make food using water, sunlight, and carbon dioxide
Species A group of animals that are physically similar and can mate with each other and produce offspring that can also mate and reproduce
Population All the members of one species in a particular area
Community All the different populations that live together in an area
Ecosystem The community of organisms that live in a particular area along with their nonliving surroundings
Ecology The study of how living things 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 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 an area can support
Natural Selection A process that makes an individual better suited to its environment
Adaptions The behaviors and physical characteristics that allow organisms to live successfully in their environments
Niche The role of an organism in its habitat
Competition The struggle between organisms to survive as they attempt to use the same limiting resource
Predation An interaction in which an organism kills another for food
Predator The organism that does the killing
Prey The organism that is killed
Symbiosis A close relationship between two species that benefits at least one of the species
Mutualism A relationship in which both species benefit
Commensalism A relationship in which one species benefits and the other species is neither helped nor harmed
Parasitism One organism living on or inside another organism and harming it
Parasite The organism that benefits from parasitism
Host The organism a parasite lives on or in
Emigration Leaving a population
Created by: hhutchinson