Learn about the first form of life on Earth, the cell.

Explore the three domains of life.

Discover the five characteristics that all living things have in common.

[Free Registration/Login may be required to access all resource tools.] This is a science text for Grade 3. It has sections on physical science, earth science, and life science. Each of those is broken down into 3 to 5 topics.

[Free Registration/Login may be required to access all resource tools.] This is a science text for Grade 4. It has sections on physical science, earth science, and life science. Each of those is broken down into eleven or twelve topics.

[Free Registration/Login may be required to access all resource tools.] This is a science text for Grade 5. It has sections on physical science, earth science, and life science. The first two are broken down into eleven topics each, and...

Understand the living and nonliving aspects of aquatic ecosystems.

Explore the reproduction of fungi.

Discover the evolution and change of plants over time.

Learn the system that scientists use to classify living things.

Explore the process of doing scientific investigations.

Understand primary and secondary ecological succession, and their importance to ecosystems.

Learn how energy is passed along through living things in a food chain and web.

Learn how the biomes of the world are determined by their climate and ecosystem.

See how human activity has affected habitat loss and destruction.

Understand the structure and function of the human lymphatic system.

Learn about preserving water resources.

Understand the human body's inflammatory responses.

Discover the characteristics of infancy and childhood in humans.

Learn about the fertilization of an egg and sperm.

Understand the egg cells, and how they develop into a human being.

Understand the role the male reproductive system plays in human reproduction.

See how organisms each have their own role in the ecosystem.

Understand how competition affects the populations in an ecosystem.