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.
The presence of an amniotic sac in early stage development points to a common ancestry among organisms. This structure is a shared feature in mammals, reptiles, and birds, suggesting a shared evolutionary history. Organisms with an amniotic sac also exhibit similarities in reproductive strategies and embryonic development, further supporting their relatedness.
The fetal period of development occurs during the third stage of prenatal development, which is the fetal stage.
Puberty is a stage of physical development during adolescence.
The fetal period occurs during the third stage of prenatal development.
sexual development among boys and girls during the transition stage
Oocytes are arrested in the prophase stage of meiosis I during their development.