Which one of the following terms describes a type of muscle contraction in which the muscle length remains the same?
a. isotonic
b. isometric
c. isokinetic
d. isotropic

For the following, determine the type of reaction and then give products.

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 the ph of a solution that has a hydrogen ion concentration of 1.0 * 10 -9 m?