PLEASE HELP I'M BEING TIMED!! Which type of star system has the most stars? A. Open Cluster
B. globular cluster
C. Eclipsing binary
D. binary star system

Which process does not require the presence of a physical substance in order to transfer heat? air in the atmosphere is heated by the ground. this warm air then rises, and cooler air falls. this is an example of what type of process? how is conduction different from radiation?

What is a difference between a mixture of elements and a mixture of compounds

If a simple machine aduces the strength of a force, what must be increased? the speed of the input force the work the simple machine performs the size of the simple machine the distance over which the force is applied