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The amniotic sac forms during the embryonic stage of development, around week 2 after fertilization. It is a protective membrane filled with amniotic fluid that surrounds and cushions the developing embryo/fetus in the uterus.
fudge your vagina;D
zygote
This question is incomplete in the sense that it does not clarify what the development tasks or stage is being asked about. In order to list the development tasks that happen during this stage, the stage, and of what, would need to be known.
for protection
Breathing movements begin during the fetal stage of prenatal development, which starts around the 9th week after conception and lasts until birth. It is during this stage that the muscles responsible for breathing, such as the diaphragm, start to develop and the fetus practices breathing movements by inhaling and exhaling amniotic fluid.
Embryo
Puberty is a stage of physical development during adolescence.
sexual development among boys and girls during the transition stage
The neurula stage is the stage of development of the nervous system of vertebrates. In a human fetus, if there are some failure in the development of the nervous system during the neurula stage, some serious birth defects could occur.
It is during the "adjourning stage" of group development that a group completes its work and disbands.
Blastula