I have Tailscale directly installed on the host and I don’t use Mullvad so I haven’t tried that setup myself.
Looks like you would need to set the TS_EXTRA_ARGS
environment variable in your container to --exit-node= --exit-node-allow-lan-access=true
with the exit node name or ip of the Mullvad node. I haven’t tried this myself though.
Plants do indeed use O2. They use if for the same reason we do, the have mitochondria that use O2 during respiration.
During the day plants typically produce more O2 than they consume, but at night they need it from elsewhere.