7. Match the correct word with the following definition: Tiny hair-like projections that extend from the cell surface. It helps move things along, they may also work like a filter Cilia External Respiration Larynx Sinuses

## Step 1<br />The problem is asking us to identify the correct term that matches the given definition. The definition describes "Tiny hair-like projections that extend from the cell surface. It helps move things along, they may also work like a filter". <br /><br />## Step 2<br />We need to match this definition with the given options: Cilia, External Respiration, Larynx, and Sinuses. <br /><br />## Step 3<br />Upon examining the options, we can see that the definition matches the description of "Cilia". Cilia are tiny hair-like structures present on the surface of all mammalian cells. They are primarily responsible for locomotion and also play a role in signal transduction.