Gastrulation marks the beginning of germ layer development in an embryo.
by the ectoderm layer
Lungs
A layer of cells and a cavity .
bones, muscles, and kidneys
Mesoderm
Gastrulation is first step towards germ layer development .
ectoderm, more specifically for nervous tissue is neuroectoderm
the word embryo has 3 syllables. em-bry-o
Placenta containng arteriesd and veins .
1. an embryo 2. supply of nutrients for the embryo 3. seed coat
fetus