Noise that interferes with the ability to detect stimuli can come from any irrelevant stimuli in the environment.

That statement is true

for example , Whales relied on some sort of earth's magnetic force to migrate often times disturbed by the noise that's produced by ships, causing them to move to the wrong direction. Which is why many whales stranded to the beach and died

A= 1 - characteristics that remain in the common ancestor and the modern organism

2 - characteristics that are new and have been modified from what was found in the common ancestor. Help it helps :)