Answer:
It's the way that people living in groups make decisions
Yes, it's one of the laws for cells.
All cells come from pre-existing cells, cells cannot be created nor destroyed.
This data is called "secondary data".
An example for a usage of a secondary data is when a researcher takes up a data collected by someone else, for exam ple a large survey, and analyses this data to receive new insights from it - this is a fairly common practice. Often for example official government data is used by scientists
That is called a speedometer
