Respuesta :
The lists that are puntuated correctly are the following:
The plant came in three varieties: yellow, pink, and white flowers; orange, pink, and yellow flowers; and plain white flowers.
- Since the commas are separating the different color of flowers in each plant, it would be confusing to put commas between the different plants. This is why semi-colons are used to separate the different plants.
I arranged my schedule so that I have study hall first thing in the morning on Mondays, Tuesdays, and Fridays.
- A comma is needed between each day of the week.
Because Shira could sing, dance, and act, she decided to audition for the school’s annual spring musical.
- A comma is needed to separate the list of things Shira can do and also at the end to separate a new idea from the list.