Answer:
- DNA damage suffered by a cell
- A lymphocyte responding to an active infection
- Removal of certain tissues during embryonic development
Step-by-step explanation:
Apoptosis is an ordered and programmed process of cellular death. It responds to the organism´s needs during development and the whole life. It is a normal and necessary process.
There are different reasons and moments in life where apoptosis takes place.
- Embryogenesis: During embryo development, some tissues need to be removed to continue to the next development stage. A typical example is the hand´s tissues. During the early stages, the hand looks like a la plate. With the pass of days, tissues between the fingers are removed by apoptosis.
- Adulthood: Adults also go through the process of apoptosis. In cases where the person develops abnormal cells with damaged genetic material, they are subjected to apoptosis.
Another scenario is a cell with an infectious agent, such as a virus, affecting the cell´s and the organisms´ proper functioning. When the active infection is affecting the cell or the tissues, these cells also suffer apoptosis.