biotic - Describes living factors in the environment., abiotic - non-living factors in the environment, autotroph - organisms that use energy from the sun to manufacture their own nutrients, heterotroph - Organisms that obtain food by consuming other living things, prokaryote - a cell that lacks a nucleus - DNA is loose within the cell, eukaryote - have a nucleus and other membrane-bound organelles, unicellular - Organisms made of a single cell, multicellular - Organisms consisting of more than one cell, sexual reproduction - need both male and female parents; genetically different offspring, asexual reproduction - need only one parent to breed; genetically identical offspring to parent, scarcity - Limited quantities of resources to meet unlimited wants, sustainability - not using up all of a natural resources in order to maintain an ecological balance, biodiversity - the variety of life in a particular ecosystem,

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