Is there an Android app like a Firewall that can monitor when other apps access the Internet?

There are certain apps on my phone that I'd like to monitor.
I'd like to know when it is accessing the internet, and maybe even block it.
I had Comodo Firewall for my laptop, but am wondering if there is an Android app that will help me do this?
Doesn't have ti be a 'firewall' but just something to help me monitor this app's Internet access.

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