Hank explains the way in which organisms grow and develop. He covers how to determine the complexity of an organism and illustrates that the digestive tract is the first part of the organism that develops.
Key Words: Animal Phyla, Layers of Tissue, Zygote, Cleaving, Blastula, Radial Symmetry, Bilateral Symmetry, Gastrulation, Gastrula, Deuterostome, Germ Layers, Ectoderm, Endoderm, Diploblastic, Triploblasts, Mesoderm
Hank explains that animals are more similar to us than we imagined. He compares the ways in which different organisms develop and shares the statistic that we are 85% similar to mice. This statistic means that, along the way, the process of development has evolved.
Key Words: Evo-devo, Developmental Regulatory Genes, Gap Genes, Hox Genes, Regulatory Genes, Unfertilized Egg, Gene Products
While customs and traditions involving pregnancy vary worldwide, the developmental process is essentially universal. Find out about the science of pregnancy from conception, through the three trimesters, and to labor and delivery.
Eddy gets a zit, which Double D tells him is a natural part of growing up. Eddy is embarrassed about it and tries to hide from the other kids. Ed finds the zit funny and gets Johnny to come over and see it, to Eddy's dismay.