Fact 1: Some mollusks are nearly microscopic.

Fact 2: Mollusks are invertebrates and are no exception.

Given the two facts above, answer the question "What are nearly microscopic?" with the following options: 
- all invertebrates
 - planets
 - some invertebrates
 - remains of prehistoric life
 - barnacles
 - Veins and arteries.
 - major threat to health
 - all vertebrates


 

   some invertebrates      