Why is an AM signal likely to be more noisy than a FM signal upon transmission through a channel?

Why is an FM signal less susceptible to noise than an AM signal ?

Which signal is more noisy during transmission through a channel?

The purpose of modulating a signal in transmission is

(A): A FM signal is less susceptible to noise than an AM signal. (B) : In FM transmission, the message signal is in the form of frequency variations of carrier waves. During modulation process, the noise gets amplitude modulated.

Why is it necessary to amplify a signal before transmission ?

What is the purpose of modulating a signal in transmission?

The waves suitable for transmission of radio signals are