The best example of a boundary is . A.
a river that divides two countries
B.
an underground tunnel
C.
an open space of land with mountains and rivers
D.
a defined territory with an established government

Please select the best answer from the choices provided

A
B
C
D

Ihave no idea what the answer is

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.