Soils in different regions differ based on the
a. local climate
b. topography of the land
c. native organisms
d. all of the above
permafrost soil (gelisol) is
a. resistant to erosion
b. fragile
c. rich in microorganisms
d. a fast developing soil

Soils in different regions differ based on the local climate, topography of the land, and native organisms. Therefore, the answer is D. All of the above. This is because soil is influenced by relief, the different landscapes on the land, organisms, and the parent material.

Permafrost soil is B. Fragile. It is a very fragile system that is easily damaged, especially when exposed to heat.

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].

Joe ran 130 yards because 3 feet make 1 yard so using this ratio 390 feet make 130 yards.