<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:skos="http://www.w3.org/2004/02/skos/core#" xmlns:gcmd="https://gcmd.earthdata.nasa.gov/kms#" xmlns:dcterms="http://purl.org/dc/terms/" xml:base="https://gcmd.earthdata.nasa.gov/kms/concept/">
  <gcmd:gcmd>
    <gcmd:termsOfUse>https://cdn.earthdata.nasa.gov/conduit/upload/5182/KeywordsCommunityGuide_Baseline_v1_SIGNED_FINAL.pdf</gcmd:termsOfUse>
    <gcmd:keywordVersion>23.7</gcmd:keywordVersion>
    <gcmd:schemeVersion>2026-04-15T10:53:30.610Z</gcmd:schemeVersion>
    <gcmd:viewer>https://gcmd.earthdata.nasa.gov/KeywordViewer/scheme/sciencekeywords/bfbfd84c-6bf0-412f-9e75-1bad5241c339</gcmd:viewer>
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  <skos:Concept rdf:about="bfbfd84c-6bf0-412f-9e75-1bad5241c339">
    <skos:broader rdf:resource="abc6f016-d1f0-4725-b847-639de054d13f"/>
    <skos:prefLabel xml:lang="en">SPONGES</skos:prefLabel>
    <gcmd:reference gcmd:text="Burn, David M. Animal World. 1980. Octopus Books Ltd. London." xml:lang="en"/>
    <skos:definition xml:lang="en">Sponges are multicellular organisms with no discrete tissues and organsbut with a skeleton composed of collagen (with or without mineralelements), and a tubular water filtration system driven by specializeduniflagellate cells.  They have a free living sessile habit and are mainlymarine at all depths and latitudes but some occur in freshwater.</skos:definition>
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