From a blog comment by blog reader “wholething” on The Ace of Clades blog on the Freethought Blogs network.
- All apes are monkeys but not all monkeys are apes.
- All monkeys are vertebrates but not all vertebrates are monkeys.
- All mammals are fish but not all fish are mammals, where mammals are fish that are evolved to be specialized to live on land (or in water) and breathe air.
- All cladistics is fun but not all fun is cladistics.
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