Question

add or remove commas, if necessary, until the sentence has correct punctuation. mars, and saturn are two planets katsuki bakugo would like to visit if he were a space explorer.

Explanation:

The conjunction "and" doesn't require a comma before it in this simple - list context. Removing the comma makes the sentence punctuation - correct.

Answer:

Mars and Saturn are two planets Katsuki Bakugo would like to visit if he were a space explorer.