Which of the following is a legal and cost-effective method for childless couples to have children?

Infertile couples can produce a baby with the help of

Give scientific reasons: $A$ couple without children can have a child by modern research.

Women who cannot produce ova,but can provide a suitable environment for fertilization and further development,can be assisted by which of the following methods?

$IVF$ in which zygote with $A$ than $8$ blastomeres is transferred into the female body is called $B$.

What is Artificial Insemination $(AI)$?