lines of symmetry
I'm guessing you mean from design to design, in which case it's just manufacturer preference. All automobiles (Ford Model T's) looked pretty much identical until Chevrolet came along and added variety, is a good comparison. It's just variety.
Is a line of symmetry
No, it is not possible. For a stationary wave, two identical waves should travel in opposite direction along a string.
It is folded and uplifted, or subducted into the mantle, depending on the type of convergent boundary.
Cuv yo mama likes it dat way fool!
Because they separated into separate beings early in the cell division process. After that, a quadrillion factors are involved in the minuscule differences all along the development process. This is how they become different people.
A shape that when you draw a line on the shape and cut along the line you get two identical shapes. A circle is an example.
If I understand your question, the shape would be "geometrical"
yes along with the andes, rockies and himalayas.
It is not mentioned in the bible, it is in the catholic bible, it was used for wiping Jesus face.