If a tree falls in the forest, it does make a noise even if no one is there to hear it. If your car got stolen and no one witnessed the theft would you simply say, “oh well”, or would you go ahead and make a police report and file an insurance claim. Of course you would because you have evidence that you owned a car. Other past events leave evidences of their existence too, just as the prone tree is evidence of its fall. We can derive predictions about past evolutionary events that have the potential to be falsified. For example the hypothesis that eukaryotes have a common ancestry with prokaryotic organisms, and that large conspicuous organisms arose from unicellular ancestors makes predictions that prokaryotic organisms should be more ancient than eukaryotic organisms, and unicellular organisms are more ancient than multicellular organisms. The fossil record demonstrates that these predictions are true. Fossil bacteria have been dated to 3.5 billion years ago, and the earliest eukaryotic fossil to no more than 2 billion years. No large conspicuous organisms appear until about 600 million years ago. Thus the sequence of appearance of organisms has the ability to falsify this phylogenetic explanation. Facts that agree with the explanation become confirmatory evidence and must be explained as well or better by any alternative explanations vying for attention.