[Free Registration/Login may be required to access all resource tools.] When you see an organism that you have never seen before, you probably put it into a group without even thinking. If it is green and leafy, you probably call it a...

All living things can be identified by their placement in a biological classification table. Students will investigate the organization of all living things and learn how to classify through the process of classifying their own shoes....

This lesson introduces basic biology principles and the characteristics of living organisms.

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

[Free Registration/Login may be required to access all resource tools.] This lesson explains the levels of organization within the biological world. It looks at the cell to organism hierarchy, and at the population to biosphere...

A large collection of articles covering many topics and specialized fields in the discipline of biology.

Study the process of by which humans respond to their environment to reach equilibrium in this tutorial. Learn that feedback mechanisms trigger living things to respond to their environment.

Covers seven characteristics shared by all living organisms.[Free Registration/Login may be required to access all resource tools.]

Through informational text, interactive activities, step-through animations, and video clips, studnet explore biochemistry and the molecules that make up living things.

Students review the study of living things and make connections back to Earth's systems. This unit focuses on how various species, grouped in populations and communities, work with the nonliving things around them to ensure survival.

Through informational text, interactive activities, animations, and video clips, students examine the chemistry of living things, and they learn how interactions from atoms are fundamental to life as we know it.

[Free Registration/Login may be required to access all resource tools.] Covers interactions between organisms.

[Free Registration/Login may be required to access all resource tools.] How organisms are organized.

Try these five self-checking quiz questions over modern classification of living things. Click on the hints to see information about each question.

This multiple-choice quiz on domains and kingdoms of living things allows students to get hints for each question and check their answers after submitting.

In this biology field lab, learners will observe a square foot area of an ecosystem surrounding our elementary school. The students will keep a journal to record the physical elements of the ecosystem which they will visit monthtly. The...

Try these five multiple-choice questions to review how living things obtain energy.

Answer these five multiple-choice questions about the history of classification of living things. After answers are submitted, students can review their mistakes.

[Free Registration/Login may be required to access all resource tools.] Covers how species interact with each other.

[Free Registration/Login may be required to access all resource tools.] How do you define a living thing? What do mushrooms, daisies, cats, and bacteria have in common? All of these are living things, or organisms. It might seem hard to...

Kingdom is the highest rank used in the biological taxonomy of all organisms. There are 6 kingdoms in taxonomy. Every living thing comes under one of these 6 kingdoms. The six kingdoms are Eubacteria, Archae, Protista, Fungi, Plantae,...

[Free Registration/Login may be required to access all resource tools.] Videos, texts, activities, and assessments about the factors that characterize living things.

Take an interactive quiz over the classification of living things. After completing the quiz, check your score, and then revisit any incorrect question for further review.

This lesson will describe biology as the study of living things.