All waves on the electromagnetic spectrum travel... A
at different speed depending on their energy
B
at the speed of light (3x108 m/s)
C at different speeds depending on their wavelength & frequency
at their own pace, because they can't be bothered

B

at the speed of light (3x108 m/s)

Explanation: because it use quizlet

because u need two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei to form isotopes.

so since they all have the same shape? i mean maybe because m& m and reeses are both chocolates