You are presented with the question "what are sometimes nearly microscopic?" and the following answer choices: 
- humans
 - magnification
 - barnacles
 - Veins and arteries.
 - gastropod shells
 - invertebrates
 - orchids
 - the sun

Now knowing that some mollusks are nearly microscopic and mollusks are the dominant invertebrate, choose the best answer.


 

      invertebrates   