"The chromosome number of the sexually reproducing parents and their offspring is the same." Justify this statement.

$(a)$ Draw a sectional view of the human female reproductive system and label the parts where:
$(i)$ eggs develop.
$(ii)$ fertilization takes place.
$(iii)$ the fertilized egg gets implanted.
$(b)$ Describe,in brief,the changes the uterus undergoes:
$(i)$ to receive the zygote.
$(ii)$ if the zygote is not formed.

What is the process of release of an ovum from the ovary called?

How can the chromosomes be identified?

At what age do girls typically reach puberty (in $years$)?

How does the embryo get nourishment inside the mother's body?