Sign In | Subscribe
Updated Biology Courses cardella

General Biology
Prof. Bryan Cardella, M.Ed.

ap biology eaton

AP Biology 
Dr. Carleen Eaton, M.D.

Start learning today, and be successful in your academic & professional career. Start Today!
Loading video...
This is a quick preview of the lesson. For full access, please Log In or Sign up.
For more information, please see full course syllabus of Biology
  • Study Guides

Bookmark and Share

Chemical Element Cycles

  • While energy flows through an ecosystem and must be constantly supplied, chemical elements are recycled. As an element moves through an ecosystem, it may cycle between several different chemical forms.

  • Not all chemical forms are usable by all organisms. It is the job of particular organisms in an ecosystem to convert the chemicals into usable forms.

  • In this Lesson, we'll look at the cycling of three important elements for biological organisms: carbon, nitrogen, and phosphorus. We'll also explore how human activities are altering the balance of certain chemicals in our environment.