The test group in an experiment for which the independent variable is changed

Sara goes on a slingshot ride in an amusement park. she is strapped into a spherical ball that has a radius 3*10^2 of centimeters. what is the volume of air in the spherical ball? use this formula: volume of a sphere=4/3pi,r^3 , where r is the sphere’s radius.

Which of the following is not a food produced in rainforests? a) coffee b) cocoa c) avocados d) wheat

Explain how the political influence of african americans leaders became weaker.