How did the elements begin to stratify?

https://academic.oup.com/mnras/article/409/4/1606/985925

Explanation:

i reaxd the wholeb  thing and fully understood

RO is a theoretical parameter that provides information about the speed of disease spreading.

Explanation: IDK if this is right, I found this on the web.

The RO activities focus on the rapid estimation of the basic reproductive number(RO) of the virus. RO ia a theoretical parameter that provides some information about the speed with which the disease can spread in a population.

There are three possibilities for the spread or decline of a disease, depending on its RO value.

IF the RO < 1, The disease will decline and eventually die out.IF the RO = 1, The disease will stay alive and stable, but there will not be epidemic.IF RO > 1, The disease will spread between people and there may be an outbreak or epidemic.

The calculate the RO of the disease the following factors are considered they are infectious period, contact rate, and mode of transmission.