USA - 1947 - A middle school teacher answers a student's question about why there are many sperm cells to one egg cell.

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DETAILS
Image Number: 6177-V54991800Royalty FreeCredit Line:DVArchive/Retrofootage/DV Archive/SuperStockCollection:DV ArchiveContributor:DVArchive/RetrofootageModel Release:NoProperty Release:NoDuration:0:01:11Frame Rate:23.98 FPSResolution:1920×1080
1940s
1947|
biological|
biology|
children|
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