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 in-depth the series of reactions that take place for a plant to produce food for itself, also known as photosynthesis. This video also explores the prerequisites (sunlight, carbon dioxide, and water) of these reactions.
Key Words: Xylem, Stomata, Chlorophyll, Chloroplast, Thylakoid, Photoexcitation, Photosystem II, Electron Transport Chain, Cytochrome Complex, ATP
Hank lists the different types of natural selection and explains each of them. He accompanies each type of selection with examples. He also briefly covers artificial selection, also known as selective breeding.
Key Words: Phenotype, Genotype, Modes of Selection, Directional Selection, Stabilizing Selection, Disruptive Selection, Sexual Selection, Directional Sexual Selection, Artificial Selection