madviking
north american scum
I don't see why that follows....
If you have a species that evolves in small, small steps, over time, those small, small steps will accumulate to something which is categorically different than what you started with.
Spoiler :
For example, consider the text in this sentence. It starts out small, but gradually increases in size until it's something that's pretty big.
You can't say what you began with is the same as what you ended with.
You can't say what you began with is the same as what you ended with.
Hence, if you believe microevolution, belief in macroevolution follows.
Edit: I don't even think 'microevolution' is even a proper scientific term. I think it's just a way for creationists to appear somewhat with the times in terms of their believes; an apparent middle ground. But seeing as I have never encountered neither micro- nor macroevolution outside of creationism debates I'm doubtful the word has any currency in the scientific community.