Which of the species of $Mycoplasma$ causes human sterility?

In the process of $in \, vitro$ fertilization, if an embryo with more than $8$ blastomeres is transferred into the uterus for further development, what is this method called?

In which process is sperm directly introduced into the ovum?

In this technique,semen is collected from the husband or a healthy donor and is artificially introduced into the vagina or the uterus of the female.

Give differences between the $ZIFT$ method and the $GIFT$ method.

An embryo with more than $16$ blastomeres,formed by in vitro fertilization,is transferred into which of the following?