Your breath as it is warmer than air around you will look like smoke
It freezes
It is mucus that you coughed from your lungs.
As we are warm-blooded,the warm water vapour that was produced out from our mouth will condese into tiny water droplets when it is in contact with the cooler surrounding air.As it is in liquid state,we can see it.
Proably he was playing outside; or maybe he got "friendly" with another dog...
Yes
coming out of their mouth
You don't.
talking without thinking what words are coming out your mouth.
No. There is no correlation between the severity of a winter and what a mammal carries in its mouth.
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Yes, when you do not clean your mouth after you eat or wake up in the morning ,you can get an amount of germs.
The mouth of the waterfall in the hole in the cliff... ... rite?