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https://www.khanacademy.org/science/hs-biology/x4c673362230887ef:genes-cells-and-organisms/x4c673362230887ef:cell-specialization/v/welcome-to-high-school-biology

Welcome to High School Biology! In this course, we will explore the beauty of life, from tiny cells to complex ecosystems. We’ll explore organism structure, cellular energy, genetics, evolution, ecology, and more, sparking curiosity and fostering a lifelong love for biology—the study of life.

Khan Academy is a nonprofit organization with the mission of providing a free, world-class education for anyone, anywhere. We offer quizzes, questions, instructional videos, and articles on a range of academic subjects, including math, biology, chemistry, physics, history, economics, finance, grammar, preschool learning, and more. We provide teachers with tools and data so they can help their students develop the skills, habits, and mindsets for success in school and beyond. Khan Academy has been translated into dozens of languages, and 15 million people around the globe learn on Khan Academy every month. As a 501(c)(3) nonprofit organization, we would love your help!

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