Unit A: Living Systems Respond to Their Environment

Celiac disease is an autoimmune disorder. Gluten triggers an immune system response, seriously affecting nutrition.

Why does drinking too much alcohol make people feel so bad? Read about four theories.

We all know someone who has been affected by cancer. What causes cancer? Why is it getting more common?

Make a model of blood and learn about the function of each of the parts that makes up blood.

Water is a precious natural resource. What happens if it gets polluted? Learn how water can be cleaned with this hands-on activity?

Spending time outside has important physical and psychological benefits. It can even help you learn better!

Learn about the organic compounds that make up lipstick as well as about some of the chemistry that goes into this popular cosmetic.

Learn about two taxonomy systems that scientists use to classify the life around us.

When you cut your finger, your immune system kicks in to protect you from pathogens.

Viruses can make you feel awful! This article explains how feeling bad might be your immune system’s way of helping you heal.

Cloning makes it possible to bring extinct species back to life. But is that a good idea?

Astronauts can experience bone loss in space. To understand why, you need to know a bit about how bones are formed and maintained in your body.

Using stethoscopes, doctors can use sound waves to detect various health issues. Learn how this device has evolved since it was invented in 1816!

A study on bird feeders and beak sizes shows how an everyday human activity can affect the evolution of another species.

Learn about the measles virus, its impact and vaccination for prevention of the disease.