Answer:
The key difference between oxygen and carbon dioxide is that oxygen is a diatomic molecule having two oxygen atoms whereas carbon dioxide is a triatomic molecule having one carbon atom and two oxygen atoms.
Me Kahan Bethun gi
Bellerophon used bow and arrows to kill Chimera !
A progressive form of a verb is formed with the ending "-in": the only verb form in the options that is formed with the ending "ing" is in option b.
The correct option is b: will have been falling. This tense is the future perfect progressive tense.