Source: https://www.devoir.tn/secondaire/Doc/4-%C3%A8me-ann%C3%A9es/Sciences-exp%C3%A9rimentales/Sciences-SVT/Exercices/s%C3%A9rie-corrig%C3%A9e-lyc%C3%A9e-pilote-reproduction-masculine--2018-2019(mr-ezzeddini-mohamed).pdf