Correct the text by inserting or removing commas. There should be a total of four commas. (Note: in this skill serial commas are not optional.) square Though tarantulas mainly prey on insects they will also eat frogs , toads, mice, or small birds.

Corrected text: Though tarantulas mainly prey on insects, they will also eat frogs, toads, mice, or small birds.<br /><br />Explanation: The sentence contains a nonrestrictive clause "they will also eat frogs, toads, mice, or small birds" which provides additional information about tarantulas' diet. Nonrestrictive clauses should be set off by commas. Therefore, a comma is needed after "insects" to separate the nonrestrictive clause from the rest of the sentence.