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Describe and discuss the major achievements of the Ummayads,and also of the Abbasids.
Zona Pellucida
The zona pellucida is a glycoprotein layer surrounding the plasma membrane of an oocyte or early-stage embryo, playing a crucial role in fertilization and preventing polyspermy.
Effaced
In medical terms, often relates to the thinning and stretching of the cervix in preparation for childbirth; in a general context, it can mean erased or made less clear.
Cervix
The lower, narrow part of the uterus that connects to the vagina, playing key roles in childbirth and menstrual flow.
Acrosome
A cap-like structure over the anterior portion of a sperm's head, facilitating the sperm's penetration of the egg.
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