they all use the same assumptions. being a assumption of what it was like in the beggining and a consistant environment that did not change.
No, not at all. Different radioactive dating methods use entirely different radioactive elements that decay in different ways, have different half-lives, have different chemistry, and so on.
Given the significant differences between different radioactive elements, then, it becomes very easy to test if radioactive decay rates are constant: one doesn't expect any change to affect all radioactive elements to behave exactly the same from a change in the fundamental forces. Thus the fact that different radioactive elements give the same answer for radioactive decay rates is really strong evidence that decay rates haven't changed over time.
Stronger evidence comes from supernovae. Supernovae would change dramatically in brightness if radioactive decay times changed. There is no evidence of this, as supernovae are highly consistent with radioactive decay times.
The assumption of initial conditions isn't needed at all for isochron dating, where if you can find multiple rocks that were formed at the same time, you can completely correct for different starting amounts of various decay elements.
When some crystals are formed, the radioactive element can take a position within the crystal, but the decay element cannot. Thus one doesn't need to know the initial amount of the radioactive element: all of the element it decayed into is still there for measurement!
But regardless, we're talking about
dozens of radioactive decay elements that are measured to be consistent with one another in hundreds to thousands of experiments. There's
no way you can just explain that away.
that is not a bacteria. and i think they would have known such a thing would happen. And why or how do they know it was a mutation.
What? They had never observed this sort of thing happening before. It was a pure accident! The original organism was single-celled. It has little in the way of holding information except for its genetic code, and has no method of sexual reproduction. Thus it must have been a mutation (actually, a series of them) that produced the multicellular forms.
well that did not answer my guestion. we can find the same similiarites all through ALL organsim. That would HAVE to happen when they ALL live on the same planet.
That does not follow. Observing the natural world doesn't just show similarities, it shows hierarchically-nested similarities. Every single organism is a modified version of its parent organism. This is an explicity prediction of evolution, and cannot be explained by creation or intelligent design.