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It's solar, because s</span>olar energy is a renewable resource that is virtually endless as long as the sun shines.<span />
It is called Adenosine Tri-Phosphate
Most animals in Animalia have backbones, but not all.
The correct answer would be C, because all organisms in Animalia are heterotrophs which means that they depend on other organisms (like animals and plants) for food.
<span>Observing that fibroblasts grew better in cell culture when blood serum was added to the growth medium instead of blood plasma. Thus proving that there was a substance in serum that made it easier for fibroblasts to grow.</span>
