A ptarmigan is a ground-dwelling bird that changes colors with the seasons. In winter, ptarmigans are entirely white. In summer, their bellies are white, but their heads, backs, and wings are mostly brown. Where are ptarmigans most likely to be found? areas with warm climates, such as the southeast United States
areas with mild, marine climates, such as those found along coasts
areas with hot, tropical climates, such as those found along the equator
areas with climates that vary throughout the year, such as the western United States

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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].