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| Pregunta | Respuesta |
| Ecosystem | Self-contained unit made up of the biotic and abiotic factors in an area |
| Population | A group of individuals of the same species in a habitat |
| Community | The organisms of all species that live in the same area |
| Habitat | The place where an organism normally lives |
| Niche | All the conditions and resources required for an organism to survive and reproduce. (its 'role') |
| Random Sampling | Sampling a population to eliminate bias |
| Systematic Sampling | Regular sampling across an area |
| Mark-Release-Recapture | popn size= No. in first sample * No. in second sample ----------------------------------------------------- marked animals in second sample |
| Abiotic Factors | The non-living factors of an environment |
| Biotic Factors | The living factors of an environment |
| Interspecific Competition | Competition between organisms of different species |
| Intraspecific Competition | Competition between organisims of the same species |
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