Will the compound o2 be joined by an ionic or covalent bond

It's joined by a double covalent bond.

Both oxygen atoms want to gain 2 electrons to have a full outer shell of 8 he ce being the most energetically stable. so each atom shares 1 pair of electrons. this is a special type of covalent bond, called a dative covalent

primary succession occurs in essentially lifeless areas regions in which the soil is incapable of sustaining life as a result of such factors as lava flows, newly formed sand dunes, or rocks left from a retreating glacier. secondary succession occurs