What makes the beginning of germ layer development in an embryo?

Gastrulation marks the beginning of germ layer development in an embryo.A germ layer is a group of cells in an embryo that interact with each other as the embryo develops and contribute to the formation of all organs and tissues.  The germ layers develop early in embryonic life, through the process of gastrulation.

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sand 60

clay 10

silt 30

sandy loam should be dominated by the sand. as the amount of sand increased, the amount of slit needed to anchor the plants' roots to the sand will also be increased. even though the amount is very little, 10% part of clay is still necessary for proper oxidation.