What is the word in bold? Children begin to lose their baby teeth around the age of six and will usually have lost all of them by age twelve or thirteen. a plural noun a plural possessive noun a singular possessive noun

## Step 1<br />The problem asks us to identify the type of the word in bold, which is "their". In English grammar, words can be classified into different types based on their function in a sentence. The options provided are plural noun, plural possessive noun, and singular possessive noun.<br />## Step 2<br />A plural noun refers to more than one person, place, thing, or idea. A plural possessive noun shows ownership or possession by more than one person. A singular possessive noun shows ownership or possession by one person.<br />## Step 3<br />The word "their" is a possessive pronoun, which is used to show ownership or possession. In this context, "their" is used to show that the baby teeth belong to the children.<br />## Step 4<br />Since "their" is used to show possession by more than one person (the children), it is a plural possessive noun.