CK-12 Biology is a high school FlexBook covering cell biology, genetics, evolution, ecology, microorganisms, fungi, plants, invertebrates, vertebrates, and physiology.
Good text book
This is the future of Textbooks
CK12 making interactive books using iBooks Author......wow! This is the future of school textbooks. Free textbooks which are aligned to state standards, and are interactive, and can be updated using iBooks 3....great! Please make more using this method as I know the school I work for will jump on them.
it’s amazing cm-12 Biology
i think this is the best for kid. my kid used to iPad for learning. now he really happy to read this book.