Biological diversity - The variety of all the different types of organisms on Earth, including diversity between ecosystems, between species, and within species., Ecosystem - A system in which living (biotic) things interact with non-living (abiotic) things such as air, water, and sunlight in a shared environment., Population - Members of a species that live in a specific area and share the same resources., Community - All the different populations of species that live in the same area (the biotic part of an ecosystem)., Species - A group of organisms that have the same structure and can reproduce with one another., Kingdom - The broadest major category in the classification system (e.g., Animalia, Plantae, Fungi, Protista, Monera)., Phylum - A subdivision of a kingdom that groups organisms based on major structural features., Class - A subdivision of a phylum., Order - A subdivision of a class., Family - A subdivision of an order., Commensalism - A symbiotic relationship in which one organism benefits and the other is not harmed or helped. Example: barnacles on whales.Example: barnacles on whales., Mutualism - A symbiotic relationship in which both organisms benefit., Parasitism - A symbiotic relationship in which one organism benefits (the parasite) and the other is harmed (the host)., Symbiosis - Any association between members of different species in which at least one organism benefits., Competition - Occurs when two or more species need the same resource, limiting the population size of both species., Niche - The role of an organism within an ecosystem, including what it eats, what eats it, where it lives, its range, and its effect on the environment., Resource Partitioning - When similar species divide a resource (such as food or habitat locations) so they can coexist without competing directly., Variability - Variation within a species — differences in characteristics between individuals of the same population., Natural Selection - Occurs when the environment “selects” which individuals survive long enough to reproduce, based on advantageous traits.,

Unit A: Section 1 Vocabulary

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