The 8th Characteristic

Biologists will tell you that life has 7 characteristics: organization, metabolism, irritability, reproduction, homeostasis, adaptation, and growth.

I think this list is missing something. It’s foundational, indisputable, and familiar even to kindergartners. But perhaps only kindergartners would call it out; several generations of biologists seem not to notice it enough to add it to their short list. Pick up a biology textbook, and you are unlikely to find a single chapter devoted to it.

Are you ready?

The 8th characteristic of life: mortality.

All living things die.

We see without seeing… Photo credit: John O’Neil (Wikimedia Commons)

Think about the consequences for a few moments. Would any of the ecosystems that you see on nature documentaries be possible without death? Would human civilization, as we know it? Read Orson Scott Card’s short story, “Mortal Gods,” and ponder.

Community blindness

Why am I writing about this as a software guy?

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