An isolated village of about 1,000 people in a developing nation may be hunting and raising only enough crops to feed themselves. such a village may have fewer than half their children surviving to adulthood. this struggling village primarily reflects the result of which revolution?
(a) neolithic revolution
(b) medical revolution
(c) environmental revolution
(d) industrial revolution

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].