Plural
Singlar means one as in kid
Plural means many as in kids
Mitochondrial Eve
I found this on the internet so i don’t know if correct or not!
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.
It is known as a Vignette
The correct answer to this question is B