preaerobic

As a noun terms

is .

As an adjective preaerobic is

(biology) describing life on earth that evolved before there was oxygen in the atmosphere.

As a noun oxygen

is a chemical element (symbol o) with an atomic number of 8 and relative atomic mass of 159994.

As an adjective preaerobic is

(biology) describing life on earth that evolved before there was oxygen in the atmosphere.

As a proper noun life

is (christian science) god.

As an adjective preaerobic is

(biology) describing life on earth that evolved before there was oxygen in the atmosphere.