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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 an organisms habitat
Photosynthesis Plants and algae need water, along with sunlight and carbon dioxide, to make their own food
Species A group of organisms 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 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.
Emigration Leaving 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 may eventually become common in that species through this process
Adaptations The behaviors and physical characteristics that allow organisms to live successfully in their environments.
Niche The role of an organism in its habitat, or how it makes its living
Competition The struggle between organisms to survive as they attempt to use the same limited resource.
Predation An interaction in which one 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 (for parasitism)
Host The organism that the parasite lives on or inside.
Created by: thertelendy