Changes to the bodies of girls start later than boys/that of boys.
In the sentence, which is correct, boys or that of boys.
Thanks in advance.
Neither is correct. You could say Changes to the bodies of girls start later than those of boys. Or Girls' bodies start to change later than boys'.
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Neither is correct.
You could say
Changes to the bodies of girls start later than those of boys. Or
Girls' bodies start to change later than boys'.
Are you sure that's true as a general statement?