Yes, you can be covered by more than one life insurance policy. For example, you could be covered by a policy taken out by your employer while also having one or more policies of your own.
Why would you have more than one life policy? One reason might be that you want different people to benefit from different policies. However, you would need to be sure that you can afford multiple premiums. If you discuss your personal situation and needs with an Ask Acorn financial advisor, you can check how much life cover you need and can afford.