front 1 Blastula | back 1 early animal embryo consisting of a hollow ball of cells |
front 2 Gastrula | back 2 advanced animal embryo consisting of two or more tissue layers |
front 3 Invertebrate | back 3 animal with no backbone |
front 4 Vertebrate | back 4 animal with a backbone |
front 5 Eumetazoa | back 5 animals with tissues |
front 6 Parazoa | back 6 animals with no tissues |
front 7 Bilateral symmetry | back 7 body symmetry where the body can be divided into two identical halves |
front 8 Radial symmetry | back 8 body symmetry where the body can be divided into multiple similar parts |
front 9 Cephalization | back 9 concentration of sensory organs and brain at the head |
front 10 Ectoderm | back 10 outer tissue layer, becomes skin and nervous system |
front 11 Endoderm | back 11 inner tissue layer, becomes digestive system |
front 12 Mesoderm | back 12 middle tissue layer, becomes muscles and circulatory system |
front 13 Deuterostome | back 13 organisms that develop “anus first” |
front 14 Protostome | back 14 organisms that develop “mouth first” |
front 15 Coelom | back 15 body cavity |