D. Radio waves
In order it would be Radio wave, Microwave, Infrared, visible, Ultraviolet, x-ray, Gamma ray
The correct answer is option B, that is, hypothesis.
A hypothesis refers to an anticipated illustration for an occurrence. It refers to a proposed illustration or a supposition made on the groundwork of inadequate proof as an initiation point for further investigation. In order for a hypothesis to be a scientific hypothesis, the scientific method needs that one can examine it.
A gas can move around freely while a solid is hard and can’t move around freely
