A sink hole i think is the answer
Answer: Nitrogen and oxygen are by far the most common; dry air is composed of about 78% nitrogen (N2) and about 21% oxygen (O2). Argon, carbon dioxide (CO2), and many other gases are also present in much lower amounts; each makes up less than 1% of the atmosphere's mixture of gases.
Explanation:
Meiosis is the cell division that occurs mostly to produce and create gametes. While mitosis occurs mostly all over the body, the sperm and egg cell is domineered by meiosis. During meiosis 1 like mitosis the cell produces 2 daughter diploid cells and when it reaches meiosis 2, the meiosis proper, generates 4 haploid cells.