Final answer:
The blank precursor embryonic cells referred to in the question are known as pluripotent stem cells, which can differentiate into any type of human tissue but cannot develop into a full organism. They are derived from totipotent stem cells and later give rise to the three germ layers.
Step-by-step explanation:
The blank precursor embryonic cells that later differentiate into the cells that form the various tissues of the body are known as pluripotent stem cells. These cells originate from totipotent stem cells, which are the first embryonic cells that arise from the division of the zygote and have the potential to differentiate into any cell type necessary for the organism's growth and development. Pluripotent stem cells can differentiate into any type of human tissue but are not capable of supporting the full development of an organism on their own. As the embryo develops, these cells become slightly more specialized or multipotent, leading to the formation of the three germ layers: ectoderm, mesoderm, and endoderm, from which all tissues and organs develop.