CK-12 Foundation
Ck 12: Organization of Cells
[Free Registration/Login may be required to access all resource tools.] Discusses how cells are organized in living things and explains the origin and significance of multicellular organisms.
Encyclopedia of Earth
Encyclopedia of Earth: Evolutionary Biology: Organism
Article explaining what organisms are, their cellular foundation, and how they get their energy and nutrition. (Published: May 26, 2010)
Other
Principia Cybernetica Web: Multicellular Organisms
Learn about the transition from unicellular to multicellular organisms. Includes related sources.
CK-12 Foundation
Ck 12: Organization of the Human Body
[Free Registration/Login may be required to access all resource tools.] A variety of learning opportunuties about levels of organization in the human body. Includes videos, activities, discussion questions, and quizzes.
CK-12 Foundation
Ck 12: Earth Science: Evolution of Eukaryotes to Multicellular Life
[Free Registration/Login may be required to access all resource tools.] The evolution of eukaryotic cells and multicellular organisms.
CK-12 Foundation
Ck 12: Earth Science: Evolution of Eukaryotes to Multicellular Life
[Free Registration/Login may be required to access all resource tools.] The evolution of eukaryotic cells and multicellular organisms.
CK-12 Foundation
Ck 12: Biology: Organization of Cells
[Free Registration/Login may be required to access all resource tools.] Learn how multicelled organisms have specialized cells that do specific jobs and single celled organisms exist without the help of other cells.
BiologyWise
Biology Wise: Multicellular vs. Unicellular Organisms
Describes the characteristics of unicellular and multicellular organisms and gives examples for each.
CPALMS
Florida State University Cpalms: Florida Students: Levels of Organization
FSERL: Explanation of the hierarchical levels of living things.
Biology 4 kids
Biology4 Kids: Animal Systems
An overview of the structure and function of a complex, multicellular organism. This article discusses levels of organization and examples of systems.
CK-12 Foundation
Ck 12: Life Science: 2.3 Cell Theory
Learn about the cell theory and levels of organization in a multicellular organism.
Open Curriculum
Open Curriculum: Multicellular Life
To describe the diversity of unicellular organisms which arose over 2 billion years of evolution.
PBS
Pbs Teachers:odyssey of Life Ii the Unknown World
Observe organisms in various environments, determine what enables the organisms to live in that environment and discuss the varied biological functions of the organisms.
Georgia Department of Education
Ga Virtual Learning: Biology: Taxonomy
In this multi-media module students derive the relationship between single-celled and multi-celled organisms and the increasing complexity of systems.
CK-12 Foundation
Ck 12: Life Science: 11.1 Human Body
Explore the levels of organization in the human body.
Khan Academy
Khan Academy: Introduction to Development
How does an organism go from a single cell to something as complex as a frog, fly, or human being? Learn the basic principles of development.
CPALMS
Florida State University Cpalms: Florida Students: The Cell Theory
Learn how the Cell Theory defines living organisms.
Science Education Resource Center at Carleton College
Serc: Observe, Describe, Compare and Contrast Cells
This investigation allows students to observe cells from multiple sources. Plant, animal and bacterial cells will be observed as well as cells from multicellular organisms and single-celled organisms. After providing written descriptions...
City University of New York
Exploring Life: The First Cells
A brief essay about older and more recent ideas on when the first cells evolved. Good coverage of different scientific theories about the origin of life.
CK-12 Foundation
Ck 12: Life Science: Protist Characteristics
[Free Registration/Login may be required to access all resource tools.] Protists are eukaryotes, which means their cells have a nucleus and other membrane-bound organelles. Most protists are single-celled. Other than these features, they...
Cosmo Learning
Cosmo Learning: Introductory Biology
A collection of video lectures from an introduction to biology course taught at Massachusetts Institute of Technology. The course covers fundamental topics like biochemistry, genetics, molecular biology, and cell biology with thirty-four...
Mocomi & Anibrain Digital Technologies
Mocomi: Cell Structure and Function
Explains cell structure and function and describes the parts of a cell.
BBC
Bbc: Gcse Bitesize: Cell Structures
Organisms are made of cells. Most organisms are multicellular and have cells that are specialised to do a particular job. Microscopes produce magnified images of cells so we can study them in detail. This lesson focuses on animal cells.
Wikimedia
Wikipedia: Gastrointestinal Tract
Wikipedia provides excellent resources and information on the gastrointestinal or digestive tract, including images and hyperlinked terms.