You are presented with the question "Plants lacking roots and stems cause what?" and the following answer choices: 
- cause their death
 - harmful substances
 - Greenhouse gases
 - dry conditions
 - chemical weathering
 - Damages them
 - deforestation
 - Dehydration

Now knowing that moss causes chemical weathering and mosses lack the roots and stems that other plants have, choose the best answer.


 

     chemical weathering    