Assuming in the sense you are talking I believe you are looking for the three modes of selection which are Directional, Disruptive, and Stabilizing.
Some isotopes are radioactive, which makes them suitable for medical imaging procedures. Radioactive isotopes have found a wide range of use in medicine. For example, they are used as tracers for diagnostic as well as research on metabolic processes. They are also used in medical imaging procedures, these isotopes include fluorine-18, gallium-67 among many others.
Body cells perform mitosis in which they copy there chromosome prior to division, then dividing once, keeping there number of chromosomes, these are referred to as diploid cells. Sex cells perform meiosis where they double there chromosomes then divide twice, creating 4 cells, each containing half the chromosomes. These are referred to as haploid cells. The answer choice is choice 2. Hope I helped!
When he died. Charlie's end of time line is when he died. Because the end of anything is its death.