it is more often
They often form a diatomic molecule.
Carbon, oxygen and nitrogen most often form multiple bonds.
Deltas
The ground level ozone is a form of pollution. There are traces of ozone in it.
constantly
OFTEN
They often form a diatomic molecule.
Most often
The comparative form of the adverb "often" is "more often."
"Often" is already in its adverb form.
what land form is often found in dry areas
Deserts often form on the leeward side of a mountain.
Icicles most often form on the south side of buildings.
Carbon, oxygen and nitrogen most often form multiple bonds.
Metals form salts often.
"often" is an adverb, it doesn't have a tense.
Floodplains