[Robert]

The Earth can be alive in the sense that it has weather, seasons, tectonic plates that move, cycles of warming and cooling, etc. There are many cycles in nature that cause the earth to evolve and mature in various ways. This could be considered life, but that depends on how loose or strict the definition of life is. If the Earth is alive then would a piece of the Earth be alive such as a rock or a doorknob. I think that I would be considered alive, but would my kidney or my shin bone be alive?

Anyway, the official scientific definition of life is essentially that all life is cellular.