In the beginning of menstruation what will happen?
Ovulation takes place
Corpus luteum degenerates
Levels of $LH$ and $FSH$ increases
Progesterone and oestrogen land increase
Where do sperms get matured?
Human eggs are
Holoblastic cleavage may occur in eggs which are
Assertion : Death is one of the important regulatory process on earth.
Reason : It avoids over-crowding caused by continuous reproduction.
Umbilical cord in mammals, contains