Which one of the following statements is incorrect about menstruation?
At menopause in the female, there is especially abrupt increase in gonadotropic hormones
The beginning of the cycle of menstruation is called menarche
During normal menstruation about $40 \;ml$ blood is lost
The menstrual fluid can easily clot
Amphimixis means
Enlarged end of penis (called the glans penis) is covered by the skin called
In the first phase of gastrulation of amphibians there occurs the separation of
The fertilization membrane during fertilization is synthesized by
What is true about cells during cleavage