Answer:
The plural possessive form of "cross" is "crosses'."
Step-by-step explanation:
To form the plural possessive, first, you add the letter "s" to the noun "cross" to make it plural. So, the plural form of "cross" is "crosses."
Next, to make it possessive, you add an apostrophe after the "s." This indicates that the crosses possess something.
For example, if you want to refer to the crosses' designs, you would use the plural possessive form: "the designs of the crosses." This indicates that the designs belong to the crosses.
Therefore, the plural possessive form of "cross" is "crosses'."