Fact 1: Some mollusks are nearly microscopic.

Fact 2: Mollusks are the second-largest invertebrate group.

Given the two facts above, answer the question "Some _ are nearly microscopic" with the following options: 
- gastropod shells
 - invertebrates
 - peachleaf willow
 - homogenous
 - barnacles
 - an organism's body
 - Veins and arteries.
 - reproduce


 

  invertebrates       