explain eggs and fertilisation to me

[zippitippitoes]

....when is it possible for an egg to turn into a creature? some ducks have grown from supermarket eggs

i have found the answer..most eggs are noy fertilised in the supermarket but these were

and are called splish and splosh

How do they become fertilised in a supermarket?

lol

bought from the supermarket and taken home and put in an incubator

so in fact fertilised at the farm although the supplier doesn't know how