Do you think these symbiotic relationships take place in only one ecosystem, such as a desert? Or do these relationships exist in multiple ecosystems? Construct an explanation that predicts patterns of symbiosis in multiple ecosystems.

The correct answer is:   [b]:   "distortion" . 

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.

According to new research, more than 5..5 million deaths are associated with polluted air. hope this : ).