Can we exist without snps in our DNA?

Although they have no particular use in DNA they are important in medical research due to their association with genes linked to disease

yes.. cause we have been existing right ? who the hell found it in the first place ? some idiot has looked deep inside to find how we have been constructed. It's not something like a brick of a building that we build, to say that we pull out the brick to see if the building will stay .. brick is not a scaffolding that can be knocked off after we are built.

No only double

Can we survive without eyelids?

Usually things are there for a reason dontcha think?