When observing muscle tissue under the microscope, what distinguishing feature can be found in cardiac muscle, but NOT skeletal muscle?

Cardiac muscle is only found in heart and skeletal muscle is found attached to bones.

When observing muscle tissue under microscope, different features found in   cardiac muscle, but not in skeletal muscle are as follows:

Skeletal muscles has long multinucleate fibers while cardiac muscles are mononucleate, with only one nucleus per fiber.The ends of cardiac muscle fibers have intercalated discs that are darker regions and they are absent in skeletal muscles.

Ithink it’s c or b for the answer.

Atp is is our little "pocket" of energy. of course, if you have too little, then it means you have too little energy, and you'll pass out. the way to not have enough, is to have no energy sources (glucose, fats, proteins). you can't have too many atp molecules. cycles like the krebs cycle produce it, but if you have too much of any substrate (or too little for that matter), the cycle stops and atp is no longer made (it stops until substrate levels are such that the process can go on). in any case, this is unlikely since atp is constantly hydrolyzed and remade, even while you're asleep. you won't have too much. if you have zero, you are dead or dying.