What does the evidence suggest as a cause of the mass extinction 65 million years ago?
a. a great earthquake
b. a great flood
c. a meteor crashed to earth
d. a drastic temperature drop

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.

Sorry but there isnt a map i would love to but if u can paste the picture of the map in my comment and i will you