b. morula, a small, tightly packed bunch of cells that is the result of cleavage. A hollow ball of cells is formed after, called the blasocyst. The gastrula still comes later,when cells begin to push at the primitive streak.
The amniotic sac is the thin, fluid-filled membrane in which the baby develops during pregnancy. It helps protect the fetus, regulate temperature, and allow for movement.
The first part to develop in a human is the neural tube, which eventually develops into the brain and spinal cord. This typically occurs during the third week of gestation.
When spores germinate, the haploid generation develops. This generation goes through mitotic divisions to produce a multicellular structure called a gametophyte.
before birth the zygote develops first into an embryo and the into a fetus
In fact the development of a seed starts from an ovule, the ovule primordium develops on the placenta of the ovary. It gets enclosed by the outer and inner integuments, which form the seed coat on maturity. Thus seed coat develops first and after fertilization the embryo comes in to being.
The fetus
In plants embryo develops in new seedling and in animals it develops into feotus which later develops into baby
An embryo forms first during pregnancy, after fertilization of the egg by sperm. It develops into a fetus around the end of the eighth week of pregnancy.
The central nervous system develops in a fetus during the first trimester of pregnancy.
The sternum develops somewhere between week 6 and 8, so well within the first trimester.
Pregnancy increases the sensitivity of the bile ducts to estrogen, and cholestasis often develops during the second and third trimesters of pregnancy
In the 3rd week of pregnancy called gastrulation, specialized cells on the dorsal side of the fetus begin to change shape and form the neural tube.
spina bifida
The heart begins to beat at the end of 3 weeks. Our 'reptilian brain' develops within the first two months, but our conscious thought does not develop until six months into the pregnancy.
Myoma develops in women mostly during the reproductive years. This grows very quickly during pregnancy when the bodyÕs creating extra estrogen.
The placenta.
The Placenta.