The femur is not part of the circulatory system because it is a bone.
<span>The right answer for this question is that during exercise, stored chemical energy is converted to energy that can be used for muscle movement. The particular chemical that is used for muscle movement is known as ATP, or adenosine triphosphate.</span>
A.) Soil Fertility "Gradually Increase" <span>during the early years of primary succession</span>
