CK-12 Foundation
Ck 12: Biology: Human Body: Organization Study Guide
This comprehensive study guide covers the main terms and concepts needed for a unit on the organization levels in the human body from organ systems to cells.
CK-12 Foundation
Ck 12: Life Science: 1.8 Characteristics of Life
Discover the five characteristics that all living things have in common.
Sophia Learning
Sophia: 7 Characteristics of Life: Lesson 4
This lesson will introduce the 7 characteristics of all living things. It is 4 of 4 in the series titled "7 Characteristics of Life."
CK-12 Foundation
Ck 12: Life Science: Protists Nutrition
[Free Registration/Login may be required to access all resource tools.] The cells of protists need to perform all of the functions that other cells do, such as grow and reproduce, maintain homeostasis, and obtain energy. They also need...