Fact 1: Some mollusks are nearly microscopic.

Fact 2: Mollusks are the dominant invertebrate.

Given the two facts above, answer the question "what are sometimes nearly microscopic?" with the following options: 
- humans
 - magnification
 - barnacles
 - Veins and arteries.
 - gastropod shells
 - invertebrates
 - orchids
 - the sun


 

      invertebrates   