Question

A timeline must include
Dates.
pictures
definitions
paragraphs.

Answer 1

dates

Step-by-step explanation:

dictionary definition:

time·line

/ˈtīmlīn/

noun

a graphic representation of the passage of time as a line.

now, our keyword in that definition is "time" corresponding words in these options are dates and time. all other 3 options do not correspond w time and therefor could not be correct.

Answer 2

Answer:it must include dates

Explanation:because a timeline has important stuff on it so it has to have dates