Science

All living things breath

OXYGEN

* We need oxygen to live.

* Oxygen makes up part of the air that is all around us

* Land animals and humans have lungs to breath.

* We can inhale (breathe in) oxygen and exhale (breathe out) carbon dioxide .

How humans breathe?

• humans has our respiratory system

• we breath in 2 steps, 1st we inhaled through our nose and mouth, then in 2nd step we exhale from our lungs to our mouth out. This process is called EXHALING.

• we need this process to live

How do fish breath?

• they use their gills to absorbe the oxygen that is in the water.

• some fish come up to the water´s surface to get extra oxygen, and absorb it through their skin

How do insects breathe?

• the insects breath in and out just like humans

• but insects do not have either lungs or gills, they have SPIRACLES