Final answer:
Likely mutagens from the list include X-rays and Ultraviolet (UV) radiation, due to their higher energy photons that can damage DNA, leading to mutations.
Step-by-step explanation:
When considering the electromagnetic spectrum, the likely mutagens from the provided list are a) X-rays and d) Ultraviolet (UV) radiation. These forms of electromagnetic radiation have enough energy to cause damage to DNA, potentially causing mutations. On the other hand, b) Radio waves and c) Visible light typically do not have enough energy to cause such damage. The electromagnetic spectrum is ordered by increasing frequency (or decreasing wavelength) as follows: radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays.
Essential Knowledge in biology tells us that different types of electromagnetic radiation are characterized by their wavelengths. From least to greatest energy per photon, these include radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays. Thus, within the context of the electromagnetic spectrum, X-rays and UV radiation are recognized as more likely mutagens because their higher energy photons can penetrate tissues and alter DNA, leading to mutations.