You are presented with the question "what are sometimes nearly microscopic?" and the following answer choices: 
- peachleaf willow
 - major threat to health
 - elephants
 - abundant fossils
 - Veins and arteries.
 - trees
 - barnacles
 - weathering

Now knowing that some mollusks are nearly microscopic and mollusks are abundant fossils, choose the best answer.


 

    abundant fossils     