The family of hares lived in one fine, green wood. Mother Zaychika and her sonny Zayka, and fathers at them wasn't.Somehow time the Hare has asked very interesting question mother:"Mother, and how we breathe?""By means of oxygen the sonny" - the Doe hare has answered"And from where he undertakes?" - the son has asked again."And let's descend we on a birchwood? Leaves of white-trunked birches, will in detail tell us to us with you about it."Well mother and hare have also gone to a birchwood.When they have come into her, hare has quickly jumped with the most beautiful and a high birch. Also I have addressed one of leaflets on her."Leaflet, hi! It is interesting to me from where oxygen undertakes. You can tell me?""Hi, hare. Of course, with pleasure! So, well look I both my brothers leaves and all other plants on Earth eat carbon dioxide and water, and in exchange we give you that oxygen which you breathe. Well and organic substances. It is called PhotosynthesisNow has understood?""Thanks, kind leaflet. For your good explanation. Now I know as we breathe, and I have learned about the new word photosynthesis"Hare grew, became him the biology after conversation with a leaflet is interesting. Now he has grown up and studies biology