A key question is how long biologists can argue that life looks like a duck, swims like a duck, and quacks like a duck, but it is actually a cat.
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Hemoglobin is well known as the molecule that transfers oxygen in blood, but its precursor, heme, is lesser known.
According to Erika DeBenedictis, “one of the big limitations of biology are the basic building blocks themselves.”
That there is a design to life is intuitive, but most of us, if challenged on it, would want to be able to defend our intuition persuasively.