Algebraical symbols are used when you do not know what you are talking about. Geometry teaches us to bisex angles. A circle is a line which meets its other end without ending. The pistol of a flower is its only protection against insects. The moon is a planet just like the Earth, only it is even deader.
Artificial insemination is when the farmer does it to the cow instead of the bull.
An example of animal breeding is the farmer who mated a bull that gave a great deal of milk with a bull with good meat. We believe that the reptiles came from the amphibians by spontaneous generation and study of rocks. English sparrows and starlings eat the farmers' grain and soil his corpse. If conditions are not favorable, bacteria go into a period of adolescence. Dew is formed on leaves when the sun shines down on them and makes them perspire.