Why does karst topography exist in some geographic location? a. few climates have enough oxygen b. most regions have rock layers other than limestone c. in most regions, the soil is too thin d. the water is too acidic enough in most places

i guess it’s a and b

b. lifting dumbbell weight at 20-degree angle from the body after a 45-degree angle

find the surface area of the sphere to the nearest square unit. use a calculator.

a. 254 in.2

b. 64 in.2

c. 127 in.2

d. 1,018 in.2

because if the tool that you are using is not balanced it there would be false mass.