Labels:barrier reef | clock | earth | grass | plaything | poster | sequence | windowpane OCR: CELL DIVISIONS DURING SPERMATOGENESIS birth puberty 16 16 19 12-14 years days days days days days days 2nd melotic meiotic primordial germ cell spermatogonia dark type A spermatogonia spermatids spermatozoa pale type primary secondary type spermatocytes sperma atocytes priman
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