Modern-day mexico city sits on the site that was once lake texcoco, home of the aztec civilization. this change is an example of

The enviroment with hedge hogs

Radius energy hope this

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.

Where's the we need to see the it could be any country!