How to choose a hard drive to boot from on a mac

I have a mac with 2 internal hard drives, I have been using one for the operating system and the other one for extra storage. My question is I installed a newer os on the second hard drive, so how do I select that one to boot from?

Answer #1

sorry it took so long for you to get a response all you need to do is hold the option key when starting your computer up

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