Answer:
We grow carrots, lettuce, radishes, and tomatoes in our backyard garden.
Explanation:
This would be the answer, as commas in this instance are used to separate options in a list. If you were to separate options in multiple lists (i.e, "There are two ways to write: with a pen or pencil, which is inexpensive and easily accessible; or by computer and printer, which is more expensive but neat.")
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