Let's see how well you remember your school classes in biology! Mitosis and meiosis are two different types of cell division in animals or multicellular eukaryotes (organisms with cells containing a distinct membranous nucleus). If we talk about the process of making new body cells or “cell division”, we mean mitosis. As to Meiosis, it is a different process of cell division during which egg and sperm cells needed for sexual reproduction are created.
Meiosis is responsible for the same number of chromosomes in each generation. It is a two-step process that reduces the chromosome number by half to create sperm and egg cells. In humans, for example, when the sperm and egg cells unite at conception, each contributes 23 chromosomes so that the resulting embryo will have the usual 46. Meiosis also allows genetic variation because of DNA shuffling during the process of cell division.
Metamorphosis is (in an insect or amphibian) the process of transformation from an immature form to an adult form in two or more distinct stages.
Binary fission ("division in half") is a kind of asexual reproduction in prokaryotes (a microscopic single-celled organism without a distinct nucleus).
Have you known about this difference?