A teacher explains to her students why the are more sperm to egg cells produced.

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DETAILS
Image Number: 6177-V53614967Royalty FreeCredit Line:DVArchive/Retrofootage/DV Archive/SuperStockCollection:DV ArchiveContributor:DVArchive/RetrofootageModel Release:NoProperty Release:NoDuration:0:01:10Frame Rate:29.97 FPSResolution:1920×1080
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