Sophia Learning
Sophia: Entropy and Negentropy: Lesson 2
At the end of this tutorial, the learner will understand the concepts of entropy and negentropy and will understand that systems gradually move towards entropy unless additional energy is introduced to them. It is 2 of 3 in the series...
Khan Academy
Khan Academy: Physiological Needs and Pregnancy
Read this passage and study the chart to complete the five-question quiz concerning physiological needs and pregnancy.
Other
Principia Cybernetica: Homeostasis, Resistance to Change
Explains what happens during homeostasis, or the tendency to achieve balance. Explains the theory of homeostasis as applied to ecological, biological, and social systems.
Other
Pricipia Cybernetica Web: Homeostasis
A short summary introducing the concept of homeostasis, with links to related words and more detailed information.
Other
Tip: Drive Reduction Theory
This site from the Theory Into Practice Websit provides scientific explanation of the drive reduction theory proposed by American psychologist Clark Hull. Good example and list of main principles.