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Plants and animals Aquatic plants and animals often have specific natural niches or characteristics that provide clues you can use for navigation. Some organisms live only at specific depths, cuing you to deeper or shallower water nearby. Other examples include sea fans, which always grow perpendicular to prevailing currents, and sand dollars (when alive), which typically orient themselves perpendicular to shore. Finding lots of fish over open sand may suggest a reef or habitat nearby. Through