Study biology online for free by downloading OpenStax's college Biology 2e book and using our accompanying online resources including a biology study guide.

Study biology online free by downloading OpenStax's Concepts of Biology book and using our accompanying online resources including a biology study guide.

This free textbook is an OpenStax resource written to increase student access to high-quality, peer-reviewed learning materials.

Biology is a science, but what exactly is science? What does the study of biology share with other scientific disciplines? We can define science (from t...

This free textbook is an OpenStax resource written to increase student access to high-quality, peer-reviewed learning materials.

This free textbook is an OpenStax resource written to increase student access to high-quality, peer-reviewed learning materials.

Viewed from space, Earth (Figure 1.1) offers few clues about the diversity of life forms that reside there. The first forms of life on Earth are thought...

Study AP Biology online for free by downloading OpenStax's Biology for AP Courses textbook and using our accompanying AP study notes.

Science - OpenStax ... Science

All living organisms share several key characteristics or functions: order, sensitivity or response to the environment, reproduction, adaptation, growth...