Growth leads to increase in volume. Must be cell division which increases the volume. But skin expands. A body is warm enough to help skin expand? No. Mixing would inhibit the skin expansion if mixing reduces entity volume. Ageing is the loosening of the skin to the skeleton or bones after certain amount of expansion, contant phase and then starts to wrinkle. What is the reason behind this phenomenon?

Cell division is multiplication of cells without mixing . Like grass multiplies.

Human growth, depending on genetics and exogenous input can be stunted, normal or gigantic, n=1, even in families.

Bones normally grow with sourtsd randomly due to hormonal chages and activity but after 19 or 20, when bone growth stops ounr postures get shorter and our feet get longer?

Some people get bunions at 15 but most, after 35?

Can growth be measured or determined as discrete or continuous form?

https://citeseerx.ist.psu.edu/document?repid=rep1&type=pdf&doi=8c1c95c61e1e98178359d1a9037aafca3967d5c7

Article On exponential growth and uniformly exponential growth for groups