Name one proprietary and one open source operating system​

Proprietary/Closed-Source: Windows or MacOS.

Proprietary might also mean a locked down, device specific or device included OS, this could be anything from the OS on your TV (standard TV, most Smart TVs use some Android spinoff, which is open source) to the computer on your car (all cars from normal cars with OBDII interfaces, to the navigation system on your car, or even a fully Smart car like a Tesla)

Open-Source: Most Linux Distros, you can say Ubuntu, Android, Debian, Fedora, or Kali. You might also be able to just say Linux even though it's technically the Kernel for those aforementioned operating systems.

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explanation:

answerthey protect the head and neck in rear impacts;