Rice University
Biology for AP® Courses
An eight-unit electronic textbook provides a guide to AP® Biology. Each of the 28 chapters include an introduction, multiple lessons, a summary, review questions, and test prep questions. Teachers see how each lesson connects to a big...
CK-12 Foundation
Ck 12: Life Science: 11.19 Digestive System Bacteria
Find out how bacteria in the digestive system works to digest food.
CK-12 Foundation
Ck 12: Life Science: 11.18 Digestive System Enzymes
Learn how the enzymes in the digestive system help with the digestive process in the human body.