Sometimes the level of fear or anxiety is reduced by pervasive avoidance behaviors. Panic attacks feature prominently within the anxiety disorders as a particular type of fear response. Panic attacks are not limited to anxiety disorders but rather can be seen in other mental disorders as well. This is customizable CME text.
The process, in which an eukaryotic cell divides, is either meiosis or mitosis. Gametes or sex cells divided by meiosis. While Somatic cells or body cells, divide my mitosis.
Aerobic respiration in eukaryotic cells occur, because otherwise the cell would perish for lack of energy to drive its metabolic processes. The same answer, but applied to a whole community of cooperating cells: People breath, because otherwise they would suffocate (i.e., perish for lack of energy).