Solar thermal, because it’s just making the plate hot, not making any energy
<span>The prototype is missing a speed control mechanism. A natural heart can adjust the rate at which it pumps blood around the body - for example, it beats quicker during exercise. As such, the artificial heart needs a monitor that regulates how fast the blood needs to be pumped around the body to maintain a sufficient supply to muscles.</span>
Answer:
In a solid atoms are packaged tightly together and move slowly
