Bill Nye: Invertebrates : You may not believe it, but these spineless wonders far outnumber those of us animals with backbones. Bill Nye shares the unique characteristics of invertebrates and explains why we are dependent on them.... (more details for Bill Nye: Invertebrates )

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File by Rebecca Kern (#883)
2009-12-14 Grade: 6-8
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2010-11-17 Grade: 6-8