When both $LH$ and $FSH$ attain peak level in the menstrual cycle ?
On first day of $MC$
On last day
Between $6$ to $10$ days
on $14^{th}$ day
A change in the amount of yolk and its distribution in the egg will affect
Spiral cleavage is found in
Yolk of egg in the vertebrates is formed in
In a simplest type of placenta the foetal blood is separated from the maternal blood by six barriers. How many barriers are lost in human placenta