Add spaces: 4.3Readthecompletereview

Answer: 4.3 Read the complete review

Add spaces: Initscompleteness,asuper-luxuriouslook!

Answer: In its completeness, a super-luxurious look!

Add spaces: Thissequencemayhavebeenimportantinthehistoryoflife,becausemolybdenum-containingenzymesthenbecamethemostimportantcatalystsusedbysomebacteriatobreakintoatomstheatmosphericmolecularnitrogen,allowingbiologicalnitrogenfixation.

Answer:
This sequence may have been important in the history of life, because molybdenum-containing enzymes then became the most important catalysts used by some bacteria to break into atoms the atmospheric molecular nitrogen, allowing biological nitrogen fixation.