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Division is the usual source.
There are many: addition, subtraction, multiplication and division are the most common. Each of these operators acts on two numbers to produce a third (which may not be different).
No. For example, division by 0 is not defined.
ether wildcats or bulldogs
multiplication and division
The authors and publishers of a book may divide it however they please, but by far the most common division is a chapter.
They are very common. They are, for example, the most common fuel source.
The most common example is lipids.
The common example is iron.
the octopus or a squid
If you have an example of a common biological apparatus you are probably holding a beaker. The beaker is the most common and well recognized biological apparatus.
gang war zones