Why do some cells, like gametes, divide differently than other cells in the human body? what is the purpose?

Gametes undergo a process called meiosis. Meiosis is the process of cell division wherein the parent cell divides its chromosomes into two sets and gives rise to germ cells.

Gametes (sex cells) have half the amount of chromosomes as a normal bodily cell and therefore have to undergo an extra cell division. Whereas mitosis (normal cells) only has one cell division, creating diploid cells (46 chromosomes), MEIOSIS has two cell divisions, creating haploid cells (23 chromosomes). This is because when two gametes join together, they have to have a total of 46 chromosomes, meaning they have to have 23 (half) each, instead of the full 46

instead of copying and pasting things off of tests or work done on computer which im sure you did, try and read over the question carefully

igneous rocks are formed by solidification of cooled magma (molten rock), with or without crystallization, either below the surface as intrusive (plutonic) rocks or on the surface as extrusive (volcanic) rocks.  

the composition depends on the source magma. there are almost a thousand types of composition found till now.  

hope this