There are different types of cells for every job in the human body. which statement is true about cells that develop differently? a. they are unidirectional. b. they are unorganized. c. they are specialized. d. they are usually damaged.

I think that the answer is C , I'm sure 90%

Anxiety, stress, or something like that

People who utilizes the progression principle will ensure their exercise program increases in frequency, intensity, time, and type. the changes need to happen gradually in order to ensure they make gains in their fitness program. a person who doesn't utilize the progression principle can still gain health benefits from exercising, but will not continue to improve in cardiovascular fitness.