Slippery slope is getting more funny the more you think about it.

The fallacy says, that if you show a movement towards a goal, eventually you could reach the goal... WHAT? How is that wrong?

Now, let's take the most ridiculous example possible.

Imagine, you have a cell, and every time it reproduces, a mistake happens that could cause it's child to be bigger and more complex.

Yeah sure... The fallacy then says, that if that were true, a few billion years later, we could have meters high bipedal organisms........... And that could never happen could it?