Answer:
The correct answer is - a lower frequency and a longer wavelength.
Step-by-step explanation:
According to the question and generally, some snakes have special organs that can sense or detect the Infrared region of the electromagnetic spectrum. However, human eys can not see or detect the infrared region.
Infrared waves have a longer wavelength and lower frequency in comparison of visible light, visible light can be seen by human eyes.
Thus, the correct answer is - a lower frequency and a longer wavelength.