1 Is this picture a colorful work of abstract art, or is it something else? If you guessed red blood cells, you are right.

2 Is it just a mass of tangled ribbons? It actually represents the structure of a common chemical found inside living cells.

3 What is this incredible object? Would it surprise you to learn that it is a human cell?

4 Biotechnology. Gene Therapy. Is it reality or fiction?

5 Begin an interesting journey into the study of life with CK-12 Biology FlexBook Eukaryotes: Protists and Fungi Plant Evolution and Classification Plant Biology Introduction to Animals From Sponges to Invertebrate Chordates From Fishes to Birds Mammals and Animal Behavior Introduction to the Human Body: Bones, Muscles, and Skin The Nervous and Endocrine Systems The Circulatory, Respiratory, Digestive, and Excretory Systems The Immune System and Disease Reproduction and Human Development Learn: What is Biology? The Chemistry of Life Cellular Structure and Function Photosynthesis and Cellular Respiration The Cell Cycle, Mitosis, and Meiosis Gregor Mendel and Genetics Molecular Genetics: From DNA to Proteins Human Genetics and Biotechnology Life: From the First Organism Onward The Theory of Evolution The Principles of Ecology Communities and Populations Microorganisms: Prokaryotes and Viruses

6 CK-12 FlexBooks Up To Date – Modular – Collective Wisdom Fits Student’s Needs Adaptable for Teacher’s Requirements Easy to Create Free of Cost For High School CK-12 Biology FlexBook, Visit: http://www.ck12.org/flexbook/book/2537