These are the most important 6 biomes:
1. Freshwater
<span>2. Marine
</span>3. Desert
<span>4. Forest
5. Grassland
</span>6. Tundra<span>.</span>
B. Soil Contamination
All the other answers are talking about clean and pure things while this answer is the only negative one. So B is your answer.
I need more points. That's why I am awnsering this, sorry.
Frogs have very moist skin, when the come in contact with the salt it burns the frog and quickly dehydrates the frog and can result in death for the frog.