Pollution controls preserve the environment, but slow business growth, which is
more important?

The answer is c) people evacuated but almost all returned

Answer barren with few trees, in the northern hemisphere;

When a lake, river or other aquatic  system  becomes  eutrophic, it can have serious negative effects on other organisms like fish, birds and even people.if an algal bloom is so bad that it causes wide-spread death  in  the  water, the organisms that die will all sink to the bottom and start to decompose.