Source: https://www.bac.org.tn/wp-content/document-bac/Bac-2018/S%C3%A9rie%20Revision%20-%20SVT/s%C3%A9rie%20N%C2%B01%20Avec%20Correction%20-%20La%20fonction%20Reproductrice%20masculine%20-%20bac%20science.pdf