Final answer:
Embryonic connective tissue includes mesenchymal and mucous connective tissue.
Step-by-step explanation:
The classification of embryonic connective tissue includes two types: mesenchymal connective tissue and mucous connective tissue. Mesenchymal connective tissue is the stem cell line from which all connective tissues are derived and is scattered throughout adult tissue to supply cells needed for replacement and repair. Mucous connective tissue, also known as Wharton's jelly, forms in the umbilical cord but disappears after birth, leaving scattered mesenchymal cells in the body.