Color
License plate
Dents
Bumper stickers
Tires
Dirty/Clean
indistinguishable, alike, impossible to tell apart, exactly the same, equal, matching
I can tell them apart by their hairstyle and attitudes (including their music). Maybe you should try the same.
properties
well you do need a way to tell them apart...
They look the same.
Children from the same mother and father will always look different from one another, unless they are identical twins. If they did not, you would never be able to tell two brothers or two sisters apart.
They mean exactly the same thing as far as I can tell.
Different atoms have different numbers of protons because the number of protons in the nucleus determines the element. Elements are defined by the number of protons they possess -- this is what sets one element apart from another.
The answer depends on what you want tell it apart from!
they cannot
Nothing. They are the same. There is no way to tell them apart.
Not very much, but I can tell you it has another "job."