What problems do refugees face traveling to Europe? O Soldiers preventing entry O Corruption in City Hall O Dangerous trip across the Mediterranean Sea Natural Disasters​

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.

Ithink the second one is correct

Dif i’m not mistaken