If you've ever handled bugs like scorpions or larger arthropods, they're remarkably similar to crawfish or crabs. They're virtually the same thing. How many mi

If you've ever handled bugs like scorpions or larger arthropods, they're remarkably similar to crawfish or crabs. They're virtually the same thing. How many millions of years ago would we need to go back, to find the common ancestor? Whales and deer are not alike in the same way. Same question, I suppose. A longer span of time, or shorter?