Content Knowledge: CK 1

Plants need to exchange gases and water with their environment as part of photosynthesis. Some plant cells have evolved specifically for this purpose.

Acid rain is any precipitation that has an unusually low pH. It can be rain, snow, fog, etc. But what is a low pH and why is this a problem?

How do the green leaves of summer change to vibrant colours in fall? Explore plant pigments in this chromatography activity.

This backgrounder explains what greenhouse gases are and how they contribute to climate change.

Biofuels like ethanol might help fight climate change. But they can contribute to food insecurity and greenhouse gases in ways that might surprise you.

Can carbon offsets help you reduce your environmental footprint, practice sustainable living and fight climate change?

What is the nitrogen cycle? How do human activities such as using fertilizer affect the nitrogen cycle? How can this cause greenhouse gases?

14 images of some plants such as carrots, cabbage and leeks whose roots, stems or leaves are used for food

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

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

What's tasty, abundant and high in protein and vitamins? Bugs! Bugs feed about 2 billion people each day. They also hold promise for food security and sustainability.

10 images of some cold-blooded vertebrates such as snakes, lizards and alligators typically having dry, scaly skin

The ocean is full of very small but very useful creatures called microbes. Without them, none of the sea plants or animals you’ve seen would exist!