The aorta, arteries, and the veins.
The common term is pregnancy. The technical term is gestation.
embryo
Genes control the sex of a developing embryo.
Genes control the sex of a developing embryo.
to provide nourishment to the developing embryo in a seed
The endosperm does. It acts much like yolk in an egg does for the embryo developing in the egg: provides the necessary nutrients for the developing embryo to grow from.
by placenta
an embryo
the uterus
developing embryo.
A mammal embryo is the developing baby inside the mother.
Three layers develop in an embryo .