7
Because the Greeks were an advanced civilization
The 7 most important things needed for a civilization are: 1) food production, 2) shelter, 3) social organization, 4) communication systems, 5) government structure, 6) transportation networks, and 7) cultural identity or shared beliefs.
Size 7 is the most common size of a woman's ring.
The most common type of tubular lock typically features 7 pins. While 8 and 10-pin versions do exist, the 7-pin design is widely used in various applications due to its balance of security and manufacturing simplicity. This makes it a popular choice for applications like vending machines and bike locks.
7
21.
Li-7
it is either 3 or 7
most common countries
Probably 1,3 or 7
The GCF is 7.