Air
Now we will take a break from those systems. We will learn about air. What is air? Air is a mixture of nitrogen (78.09%), carbon-dioxide (0.03%), oxygen (20.95%), argon (0.93%), others (0.003%). The main thing we need in air is this kind of gas called oxygen. If we kill a lot of plants and produce lot of carbon-dioxide, we, the humans will soon die. The earth is the only place that there seems to be oxygen. There’s not yet found that there is air, or they haven’t found oxygen in any other planet. But maybe there really is oxygen in other planets. And that is a question. Plants breathe in carbon-dioxide which is the trash from human that’s made from processing food into white liquid which is energy. Oxygen is a type of gas that we breathe in. We breathe in oxygen about every second or more. But how does the oxygen come in to your body? First oxygen comes to your body from your nose or mouth. This the first stage in an order for air to come in. Then the oxygen goes to the lung then air sacks. From the air sacks the oxygen goes to the capillaries. And the last, blood delivers oxygen to every cell in your body and that means the blood takes the oxygen a trip around your body. So if you can, exercise a lot and breathe in a nice clean country air. Don’t forget to breathe in oxygen too!
