Life on Earth is comprised of the most abundant elements in the universe (as a matter of fact they are more abundant off planet than on).

So why would ET life be "absolutely nothing like life as we know it?"

To me, it stands to reason that ET life would be similar to life life as we know it, perhaps even in form.

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"Where the telescope ends, the microscope begins. Which of the two has the greater view?" - Hugo

"Men occasionally stumble over the truth, but most pick themselves up and hurry off as if nothing had happened." - Churchill