"Almost all living things need oxygen. They use this oxygen during the process of creating energy in living cells. Just as water moves from the sky to the earth and back in the hydrologic cycle, oxygen is also cycled through the environment. Plants mark the beginning of the oxygen cycle. Plants are able to use the energy of sunlight to convert carbon dioxide and water into carbohydrates and oxygen in a process called photosynthesis. This means that plants "breathe" in carbon dioxide and "breathe" out oxygen.
Animals, and they include humans, form the other half of the oxygen cycle. We breathe in oxygen which we use to break carbohydrates down into energy in a process called respiration. Carbon dioxide produced during respiration is breathed out by animals into the air.
So oxygen is created in plants and used up by animals. But the oxygen cycle is not actually quite that simple. Plants must break carbohydrates down into energy just as animals do. During the day, plants hold onto a bit of the oxygen which they produced in photosynthesis and use that oxygen to break down carbohydrates. But in order to maintain their metabolism and continue respiration at night, the plants must absorb oxygen from the air and give off carbon dioxide just as animals do. Even though plants produce approximately ten times as much oxygen during the day as they consume at night, the night-time consumption of oxygen by plants can create low oxygen conditions in some water habitats." - the oxygen cycle - http://water.me.vccs.edu/concepts/oxycycle.html
No! Not the flu, you poor love. I just got my flu jab yesterday, I have to protect himself from flu -his is free, I gotta pay for mine;0)
Very pretty shot, gorgeous sky. I posted similar shot yesterday minus that gorgeous sky. Look after yourself
Very pretty shot, gorgeous sky. I posted similar shot yesterday minus that gorgeous sky. Look after yourself
@salza - thank you, sally.