Thanks for reading, Praveen Rajaretnam!

Phosphorus is required for ATP which transports energy in our cells as well as for DNA itself.

I personally would define intelligent life as something like or approaching human level intelligence: having some kind of actual language (spoken, signed and/or written) to pass on knowledge and being able to make tools to manipulate the environment. For this article and the purposes of the Drake equation, intelligent life is defined as life that has reached a point where it can send and receive radio signals.

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