A similarity would be that they are both muscles. A difference would be cardiac muscle is only in the heart while skeletal muscle can be found throughout the body. Another similarity would be that they are both striated. Another difference would be that skeletal muscle is generally on conscious or voluntary control while the cardiac muscle is automatically used to keep your heart pumping
D. This is because convection is the process of heat passing through liquid or gas.
C. All of the above
The cell membrane helps maintain the osmotic potential by doing both A and B, it does not make ATP however.