If there were no trees, would there still be enough oxygen for us to breathe?

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Air is mostly made up of a gas called nitrogen. But about one-fifth of the air (21%) is oxygen – the gas our bodies use when we breathe.

All living things need oxygen in order to stay alive but plants, algae and a group of bacteria called cyanobacteria, can also make oxygen. These plants, algae and cyanobacteria make more oxygen than they use and the extra oxygen goes back into the air. So, the oxygen is sort-of recycled, rather than used up.

Plants like trees use their leaves to make oxygen. But what if there were no trees left on Earth – would there still be enough oxygen in the air for us to breathe?

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How does a seed know what to grow into?

Seeds come in different shapes and sizes but how do they know what kind of plant to grow into? The answer to this fantastic question about plants actually tells us about how all life on Earth works.

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Inside all living creatures there is information that tells their bodies how to grow, develop and work. But what is this information and how does it create life?

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