Because the need for measurement is universal and it developed in different ways in primitive cultures. It is only later, with interregional, and then international trade that there was a need for a single system.
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Feet and inches are part of the Imperial measurement system.
The metric system is used by scientists because it is based on factors of ten. This makes it easy to convert from one unit of measurement to another.
This question makes no sense. An absolute measurement cannot approach anything as it is just one measurement that measures the exact thing that it is measuring.
The system of measurement commonly used in most of the world is the SI or Metric system. Aside from that one, there are various others that are used in small areas by relatively few people. One of those is the "English" system, used in Burma, Liberia, and the USA.
A decimal number is a way of representing a number in such a way that the place value of each digit is ten times that of the digit to its right. Measurement units in the metric system are related to one another by multiples of powers of ten (or 1000).