What is the most common reproduction in unicellular organisms? How does this happen?

Single-celled organisms most often reproduce by division. This is the simplest way and does not require a second organism or specific organs. During fission, the nucleus splits into two. All internal elements are divided into two parts and a screed is formed. Millions of new organisms emerge from one organism in several hundred divisions. Another way of reproduction of unicellular organisms is budding. This process is similar to division. The most rare way of reproduction of unicellular organisms is sexual.