I wonder how Robert Monroe's Loosh story fits into the picture. According to this story, which is explained better by the INSPEC Robert communicated to than BB, an intelligent life form searched around for suitable planets that could be used for creating life forms that would have the requisite carbon oxygen cycle so emotional energy/Loosh could be created. Therefore, this planet existed long before any of us came to life and started excreting chemicals through the pores of our skin.