The brain controls functions such as thinking and perceiving
A mangrove is a tree or shrub that grow in tropical coastal swaps and mangroves are keystone species. Because crabs is one of them
Acid Rain is the problem threatening many of Europe's (most specifically Germany's) forests, lakes, and rivers. Acid rain travels via the wind and the acid pollutants can travel through this said wind to multiple countries. It was a large problem in the 1970's and 80's.