CK-12 Foundation’s Biology FlexBook covers the following chapters: What is Biology – investigations, methods, observations. The Chemistry of Life – biochemical, chemical properties. Cellular Structure & Function – DNA, RNA, protein, transport, homeostasis. Photosynthesis & Cellular Respiration – energy, glucose, ATP, light, Calvin cycle, glycolysis, Kreps cycle. The Cell Cycle, Mitosis & Meiosis – cell division, sexual, asexual reproduction. Gregor Mendel & Genetics – inheritance, probability, dominant, recessive, sex-linked traits. Molecular Genetics: From DNA to Proteins – mutation, gene expression. Human Genetics & Biotechnology – human genome, genetic disorders, sex-linked inheritance, cloning. Life: From the First Organism Onward – evolution, extinctions, speciation, classification. The Theory of Evolution – Darwin, ancestry, selection, comparative anatomy, biogeography. The Principles of Ecology – energy, ecosystems, water, carbon, nitrogen cycles. Communities & Populations – biotic ecosystems, biodiversity, resources, climate. Microorganisms: Prokaryotes & Viruses – prokaryotes, viruses, bacteria. Eukaryotes: Protists & Fungi – animal-, plant-, fungus-like protists, fungi. Plant Evolution & Classification – plant kingdom, nonvascular, vascular, seed, flowering plants. Plant Biology – tissues, roots, stems, leaves, growth. Introduction to Animals – invertebrates, classification, evolution. From Sponges to Invertebrate Chordates – sponges, cnidarians, flatworms, roundworms. From Fish to Birds – characteristics, classification, evolution. Mammals & Animal Behavior – traits, reproduction, evolution, classification, behavior. Introduction to the Human Body: Bones, Muscles & Skin – skeletal, muscular, integumentary systems. The Nervous & Endocrine Systems – structures, functions. The Circulatory, Respiratory, Digestive & Excretory Systems – structures, functions, Food Pyramid. The Immune System & Disease – responses, defenses. Reproduction & Human Development – male, female, lifecycle. Biology Glossary.