The texture in the opening phrase of this work is monophonic. Monophonic texture is when music only contains a melody line with no harmony-it might be played by one person on their own, or by many people playing the same melody. Monophonic texture includes a single melodic line with no accompaniment. it is the simplest and most basic texture.
Photosynthesis produces carbon dioxide (chemical gas) which is used in cellular respiration to make oxygen. That oxygen is then used in photosynthesis to make more carbon dioxide and so on.
