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Have you tried? If so, what did it do or not do that failed to meet your requirements?

a.sh&
b.sh&

or

a.sh& b.sh&

That is exactly what the "&" does. It creates a new process so that processor time is allocated to the new process along with the existing processes.

Since this is "not homework", perhaps it...

If you have a single processor, there is no such thing as starting scripts "simultaneously". One will be started first, then the other.

Actually "a.sh &" and "b.sh &" will run both scripts...

How do you define of parallel processes? And what is your distinction between parallel and background?

"&" causes shell to fork another copy of itself.

Is this homework?