10 points! give an example of a time when introducing an animal into an ecosystem changed it dramatically for the worse

The nile perch.
It was introduced to Lake Victoria in the 1950s and is native to African lake and rivers. 
The population of nile perch exploded in the 1980s, and caused quite a few native species in Lake Victoria to go extinct.

Amath expression is a collection of one or more terms, which are separated by the signs ( + , - , x , / ).example :   8+b8+b  or  a−3a−3in algebra, an equation is a mathematical statement with two expressions where, each expression is separated by an equal (=) sign. variables can be present on both the sides of the equality (=) sign and we use letters to denote such variables.example 1:   x=4+2x=4+2  , [here, we can observe that the variable is present only on one side of the equation].example 2:   2x+3=x+42x+3=x+4  , [here, we can observe that the variables are present on both side of the equation].

D. coal i hope that