Agnatha are ancient jawless fish that include lampreys and hagfish. They are also probably the earliest vertebrates and have ectoderm.
The endoderm and ectoderm
They have two layers the endoderm and ectoderm.
There are three layers: ectoderm, mesoderm, and endoderm.
The three germ layers are the ectoderm, the mesoderm, and the endoderm.
During blastula there will be two germ layers 1)ectoderm 2)endoderm, after gastrulation , there will be three germ layers 1) Ectoderm 2) Endoderm 3) Mesoderm
From inner to outer, the germ cell layers are the endoderm, mesoderm, and ectoderm. Each of the three layers develops into a different part of the embryo: the endoderm into the respiratory, auditory, and digestive system; the mesoderm into the skeleton and muscles; and the ectoderm into the skin, tooth enamel, and nervous system.
Endoderm
The endoderm.
The endoderm and ectoderm
Cnidarians secrete mesoglea - which is a jelly-like substance that separates the ectoderm and endoderm.
Phylum Platyhelminthes have three tissue layers: ectoderm, mesoderm, and endoderm.
ectoderm is the young epidermis, same with endoderm, it is the young gastrodermis.
Ectoderm, endoderm, and mesoderm can produce epithelial tissues
They have two layers the endoderm and ectoderm.
Ectoderm, endoderm and mesoderm.
ectoderm
mesoglea ;)