They are called an octet.
its called a period
A replication fork
The correct answer is "appositive."
Today, there is no territory between the US and Mexico. They are separated by a single border.
The difference between the greatest and least numbers in a set of data is called the range.
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There are no valves between the right and left ventricle. The ventricles are separated by the interventricular septum.
The elements with atomic numbers between 57 and 71 are called lanthanoids (or lanthanides).