A liquid and a solid mixed together. What does NOT indicate that a chemical change has taken place?

Which of the following is a possible reason for sleep? a) growth b)digestive c)speed d)intelligence

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.

Is a measure of the different types of organisms in a community. question options: tertiary secondary primary none of the above