How many hills are located on this island?

Four types of motile cells in human body?

Which statement describes john tuzo wilson’s contribution to the theory of plate tectonics?

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.