The onset of puberty and the onset of menopause are examples of age.

Biological  age.

Explanation:

Your biological age is that based on the quality of your body. It is the set of conditions of your biological device. It is related to the aging of cells and is a consequence of physical and mental habits and defines their quality of life. It is defined by your mood, health, disposition, etc. The biological age is also defined by the common physiological changes in the human organism, an example of this is puberty and the onset of menopause.

a.) a destruction fo cells by viral reproduction

ionic bonds are two oppositely charged ions that attract. a sodium ion has a 1 positive charge; a chloride ion has a 1 negative charge. sodium and chloride have oppostive charged ions that attract which forms an ionic bond. a chemical bond formed when two atoms share electrons is called