The answer is (a) Mesozoic and it lasted 180 million years.
Relative scales<span> are </span>scales<span> that share the same set of notes — much like you have DNA in common with your relatives. Every major </span>scale<span> has a </span>relative<span> minor </span>scale<span>, and every minor </span>scale<span> a </span>relative<span> major. For example, the C major </span>scale<span> and the A minor </span>scale<span> are </span>relative scales<span>.</span>
