A Healthy Balance

As you can see, oxygen is constantly being used up and carbon dioxide is constantly being produced. This happens whenever living things respire or when things burn. However, the amount of oxygen in the air does not decrease. The amount of carbon dioxide in the air does not increase either. How is this possible?
In a typical day, an average person breathes in and out up to 13 000 litres of air. this would fill abaut 50000 drink cans.
The answer lies with plants. plants are responsible for maintaining the balance of oxygen and carbon dioxide in the air. Plants take in carbon dioxide from their surroundings during photosynthesis. At the same time, oxygen is produced and released in to the surroundings. this exchange of gases happens continuously and helps to keep a healthy balance of oxygeen and carbon dioxide in the air.

Air and The Respiratory System

Air is All aound Us

Air is everywhere! you cannot see it but there are ways to tell that is it there. You can feel or even hear air when it moves.
Moving air is called wind. a strong gust of wind can move things, like Sue's hat. around. We can also see things around us move when the wind blows.
Typhoons are common in some parts of the world. These are violent winds that are accompanied by very heavy rain.

Systems

take a peek into a microscope and this is what you may see. Do you know what these are?
Any living thing that can live on its own is an organism. A organism are made up of cells. A cell is the basic unit of life that forms all living things on the earth. Bacteria and yeast are simple living things consisting of only one cell. On the other hand, animals and plants are made of millions of cells. so are you.
Do you know how your cells arranged to form your amazing body?
Cells unite to form tissues. An example is your muscles. Several types of tissues group to make an organ, such as your stomach.
Organs that work together to perform a special purpose form a system. The various systems of your body form a complex system, which is you!.