habitat - the natural conditions and environment, for example, forest, desert, or wetlands, in which a plant or animal lives.

area - the extent of part of a surface enclosed within a boundary, or the extent of the surface of all or part of a solid.

perimeter - a boundary that encloses an area.

endangered - in danger or at risk, especially of ceasing to exist.

extinct - having died out or ceased to exist.

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Encarta® World English Dictionary © 1999 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc. oomsbury Publishing Plc.