Welcome to Guest Hollow’s Free Biology Textbook!
Get ready to learn about science and the natural world in this absolutely FREE book! Why do are we offering a free book? Have a look at our About Us page, and you’ll get a sense of who we are and why we care about homeschoolers like we do. Having said that, please consider using Guest Hollow as your source for other curriculums and materials. Despite being a tiny mom-and-pop, our company has a lot to offer, and it’s growing all the time. Please explore our site as well as our social media presence and let us know what you think!
This FREE book is designed to be used with Guest Hollow’s Free High School Biology Curriculum, but anyone is free to use it. 🙂
We’ve taken the well-known and rigorous CK-12 biology textbook and edited it (thanks to a Creative Commons license) to fit a Christian creationist perspective.
Choose a chapter or section and dive right in!
If you are using the FREE version of our biology curriculum, please consider donating to help support our efforts. We are so appreciative of your support! If you can’t donate, please spread the word about us!
What is Biology?
This chapter provides an introduction to scientific investigations, methods, observations, and communication.
The Chemistry of Life
This chapter covers matter, the significance of carbon, lipids, proteins, nucleic acids, amino acids, biochemical, and chemical properties and reactions.
This chapter introduces cell structure and function, features of prokaryotic, eukaryotic, plant, and animal cells. General structures and functions of DNA, RNA, protein, cell transport, and homeostasis.
This chapter introduces energy, glucose and ATP’s role, stages of photosynthesis, light reactions, the Calvin cycle, cellular respiration, glycolysis, the Krebs cycle, the electron transport chain, anaerobic and aerobic respiration, and fermentation.
The Cell Cycle, Mitosis, and Meiosis
This chapter covers cell division, the process of producing new cells, and sexual and asexual reproduction.
This chapter covers Mendelian genetics, inheritance, probability, dominant, recessive, and sex-linked traits.
This chapter covers DNA, RNA, protein synthesis, mutation, and regulation of gene expression.
This chapter covers the human genome and genetic diseases/disorders, including autosomal vs. sex-linked inheritance patterns, DNA technology, The Human Genome Project, and gene cloning.
This chapter introduces Linnaean classification.
Creationism vs. the Theory of Evolution
This chapter gives you a foundation to understand creationism vs. evolution.
The Principles of Ecology
This chapter covers ecology and its relationship to energy, ecosystems, and the water, carbon, and nitrogen cycles.
This chapter covers communities as part of biotic ecosystems, populations: size, density, dispersion, and growth, biodiversity, natural resources, and climate change.
This chapter serves as an introduction to the specifics of prokaryotes and viruses, as well as the interactions between bacteria and other organisms.
This chapter serves as an introduction to the Kingdom Protista, the three types of protists: animal-like, plant-like, and fungus-like protists, and the classification and ecology of fungi.
This chapter is an introduction to the plant kingdom and covers the four categories of plants: nonvascular plants, vascular plants, seed plants, and flowering plants.
This chapter discusses plant tissues, including roots, stems, leaves, and plant growth.
This chapter gives an overview of animals, including invertebrates, discussing characteristics and classification.
This chapter provides an overview of sponges, cnidarians, flatworms, and roundworms, discussing structure, function, reproduction, and ecology.
This chapter is an overview of vertebrates from fishes to birds covering their characteristics and classification.
Mammals and Animal Behavior
This chapter provides an overview of mammals covering mammalian traits, reproduction, and classification. Animal behavior is also discussed, including learning and communication, as well as migration, aggression, courtship, and mating.
© CK-12 Foundation
Licensed under CK-12 Foundation is licensed under Creative Commons
Attribution Non Commercial 3.0 Unported (CC BY-NC 3.0)
Changes/edits were made to the original ck12 biology text by Guest Hollow.
Changes are not endorsed by CK-12 in any way.