Maybe they came from different groups or mixed semen
Answer:
Our atmosphere (air) is comprised of 78% of nitrogen. However, this nitrogen is in its elementary state (N₂) and therefore is quite inactive, so the plants can not use it directly. Changing the elementary nitrogen into more reactive forms (NH₃, NO₂, HNO₃) is occurring through the process called nitrogen fixation. It is happening via two processes.
First one is physical nitrogen fixation. When some type of atmospheric physical energy (lightning bolt, for example) reacts with N₂, it splits it in two very reactive N atoms, enabling them to react with oxygen in order to form NO₂.
Second process is biological nitrogen fixation. It's done by bacteria, special bacteria living in the soil, able to use elementary nitrogen for its metabolical pathways resulting in production of ammonia, which can be used by plants. It's noteworthy that bacteria are responsible for about 90% of all nitrogen fixation.
Because the sun provides not only provides for living things, it provides for some indirectly because the sun is everywhere. That being said, a good example would be the grass. And what eats the grass? Animals and critters of course. Sun also makes trees grow which gives us humans oxygen. The sun helps us in many ways whether you know it or not.
The preschool years largely encompass what Erikson called the initiative vs. guilt stage
