Mini world reflection

Right so this is the start of my third year I will try with no gaps my challenge .
This is of one of my new creations Mini beach in a glass globe shells seaweed and succulents,
In the centre of the blip is a right handed shell that is over 2 million years old. and next to it is the modern version that is left handed twirl to the shell,why evolution turned  it round the other way I don't know ? do you.