661In most ecosystems, the ultimate original source of energy that flows through food chains is generally what?
662The specific position that an organism occupies within a food chain is generally referred to as its what?
663Animals positioned at the very top of a food chain, with no natural predators, are generally called what?
664A close, long-term biological interaction between two different species is generally referred to as what?
665A symbiotic relationship in which both participating species benefit is generally called what?
666The relationship between bees and flowering plants, where bees get nectar and plants get pollinated, is a classic example of what?
667A symbiotic relationship in which one organism benefits while harming the other, such as a tapeworm in a host, is generally called what?
668The natural physical environment in which a particular organism normally lives is generally called its what?
669The specific functional role that an organism plays within its habitat and ecosystem is generally referred to as its what?
670A species whose population has declined so much that it faces a serious risk of dying out is generally described as what?
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