Learn about the different levels of organization in living things, from cells to organisms.

An illustrated overview of the structure and function of the cell and its structures.

Learn how the Cell Theory defines living organisms.

[Free Registration/Login may be required to access all resource tools.] From basic cells to tissue to organ systems, identify and understand the structures and functions of the human body's organization.

FSERL: Explanation of the hierarchical levels of living things.

Review the main vocabulary and processes in plant tissues and organs.

Self-playing slideshow, with an accompanying quiz, introduces students to the concept of the human body as a system of cells, tissues, and organs.

Explore the levels of organization in the human body.

For this lesson, students learn about the specialization of cells to perform different functions, and how they are organized into tissues and organs in the human body.

Bobbi Seleski catalogs biology from our body and beyond, tracking how unicellular organisms, tissues, organs, organ systems, organisms, populations, communities, ecosystems, and our biosphere build off of each other and work together....

This lesson will show the 8 levels of organization in living organisms, ranging from smallest to largest. It is 2 of 4 in the series titled "8 Levels of Organization."

This lesson will show the 8 levels of organization in living organisms, ranging from smallest to largest. It is 4 of 4 in the series titled "8 Levels of Organization."

This lesson will show the 8 levels of organization in living organisms, ranging from smallest to largest. It is 1 of 4 in the series titled "8 Levels of Organization."

This lesson will investigate why a person's body might either accept or reject a transplanted tissue or organ.

Site features high school-level comprehensive info on the structure and function of seed plants organized into shoot and root systems. While presented with lots of detail, clear illustrations and animations help make sense of the parts...

The biographies in the PEER Curricula site emphasize the early life of scientists and how they developed their interests. This biography of Peter Medawar is no exception. His teachers were important mentors in his life and led to his...

An overview of the structure and function of a complex, multicellular organism. This article discusses levels of organization and examples of systems.

These microscopic images of different cells and tissues from the human organs gives an idea of some the pathological processes that occur and the importance of histology.

A very thorough examination of endometriosis supplemented with a depiction of the female pelvic organs.

Find out if cloning human body parts for the purpose of transplant is possible in this interactive worksheet. Read the information, and then hover the mouse over review questions to reveal the answers.

Self-guided learning activity where students learn about the functions, processes, and anatomy of the human body. There is a short quiz at the end of the lesson to check for understanding.

Nestled in the tissues of your neck is a small, unassuming organ that wields enormous power over our bodies: the thyroid. This video explains how the thyroid, like the operations manager in a company, is tasked with making sure that all...

Lupus (SLE) is an autoimmune disease that can affect virtually any system in the body. Think of it as an allergic reaction to one's own body, which then attacks its own cells and tissues, causing inflammation, pain, and possible organ...

Take this ten-question review quiz over animal systems. Read more about each question after an incorrect answer is given.