3. What do we call structures that no longer have a function in an organism? Vestigial Homologous Analogous Deleterious

## Step 1<br />The question is asking for the term that describes structures in an organism that no longer have a function. The options provided are Vestigial, Homologous, Analogous, and Deleterious.<br /><br />## Step 2<br />Vestigial structures are remnants of organs or structures that had a function in an early ancestor. These structures no longer serve a purpose in the current organism.<br /><br />## Step 3<br />Homologous structures are those that have a similar structure but may have different functions. They are not necessarily non-functional.<br /><br />## Step 4<br />Analogous structures are those that perform a similar function but have different structures. They are not necessarily non-functional.<br /><br />## Step 5<br />Deleterious structures are those that are harmful or damaging. They are not necessarily non-functional.