21: potassium has 20 neutrons
22: is d
The process of photosynthesis in plants releases oxygen into the atmosphere. Respiration by plants and animals, as they use the energy stored in food, and the process of decomposition of dead organisms, releases carbon dioxide into the atmosphere. All three work together to maintain the carbon dioxide-oxygen cycle.
Answer:
We'd all freaking freeze to death and be standing there like the black beetles trend.
Explanation:
This is a joke, please don't take this seriously.
It indicates that there is only one oxygen molecule