The outline below is an evolving main menu for our high school, NGSS-aligned biology curriculum. If you’re a current user of our AP or College-level biology, you’ll find much that’s …

The biology archive contains legacy biology content, and is not being updated with new content. For our most up-to-date, mastery-enabled courses, check out Middle School Biology, High …

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The Explorer's Guide to Biology (XBio) is a free resource for students in higher education and self-learners. Departing from traditional textbooks, XBio presents biology as detective work; a …

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For our most up-to-date, mastery-enabled courses, check out High School Biology and AP Biology. Welcome to biology! What is life? This unit is part of the Biology archive. Browse …