Learn how basic elements form molecules to support life.

[Free Registration/Login may be required to access all resource tools.] Biodiversity is a measurement of the amount of variation of the species in a given area. More specifically, biodiversity can be defined as the variety of life and...

[Free Registration/Login may be required to access all resource tools.] Do you ever wonder why some birds are big like ostriches and some birds are small like robins? Or why a lion has a mane while a leopard has spots? In the 19th...

[Free Registration/Login may be required to access all resource tools.] Fossils are the preserved remains of animals, plants, and other organisms from the distant past. By studying fossils, evidence for evolution is revealed....

Review the safety precautions while performing scientific investigations.

See how air pollution affects human health.

Understand the structure and function human cardiovascular system.

Explore the characteristics and behaviors of lizards and snakes.

Understand the ecological importance of insects, and why they are important to humans.

Discover the human uses of fungi.

Explore the diversity of the domain Archaea.

Understand the genetics and characteristics of viruses.

Explore the molecular evidence for evolution.

Understand what happens to a cell during mitosis.

Understand the processes of osmosis and diffusion.

Explore some non-infectious diseases and how to prevent them.

Understand the role that the carbon cycle plays in the ecosystem.

Learn about Darwin's influences that led to his discoveries of change in species over time.

[Free Registration/Login may be required to access all resource tools.] Seedless plants can reproduce asexually or sexually. Some seedless plants, like hornworts and liverworts, can reproduce asexually through fragmentation. When a small...

[Free Registration/Login may be required to access all resource tools.] Even though plants and animals are both eukaryotes, plant cells differ in some ways from animal cells. Plant cells have a large central vacuole, are surrounded by a...

[Free Registration/Login may be required to access all resource tools.] If pathogens get through the body's first two lines of defense, a third line of defense takes over. This third line of defense involves the immune system. The immune...

[Free Registration/Login may be required to access all resource tools.] Imagine you open a gallon of milk, and you suddenly smell a foul odor. Your sense of smell has informed you that the milk has spoiled. So you pour the spoiled milk...

[Free Registration/Login may be required to access all resource tools.] An organism goes extinct when all of the members of a species die out and no more members remain. Extinctions are part of natural selection. Species often go extinct...

[Free Registration/Login may be required to access all resource tools.] When an herbivore eats a plant, the energy in the plant tissues is used by the herbivore. Every time energy is transferred from one organism to another, there is a...