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Anonymous
That organ is called as uterus. The size of the uterus is 3*2*1 inches. It enlarges to enormous size to accommodate the fetus.
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They copulate.
Lamarck.
In a pouch mainly.
The Heart.
Egg -> tadpole -> frog (Note, most fail to develop properly.)
it's possible
Horses are like most mammals (humans, too) and the unborn develop in a uterus.
The heart is the first organ to develop in a fetus. Together, blood and the circulatory system, that is powered by the heart, form the first organ system.
fertilize egg
The heart is the second organ to develop in the embryo, following the development of the neural tube. It starts to form and beat by about the third week of gestation.