#19 is pneumonia, #20 is stick to well marked trails
ok here it is (ignore this random sentence I added it so this is at least 20 charecters long)
Both C and D are the answers. But I will go with D
Answer:
Muscle contraction is the activation of tension-generating sites within muscle fibers. In physiology, muscle contraction does not necessarily mean muscle shortening because muscle tension can be produced without changes in muscle length, such as by holding a heavy book or a dumbbell at the same position. The termination of muscle contraction is followed by muscle relaxation, which is a return of the muscle fibers to their low tension-generating state.
Explanation:
