His immune system is using the first line of defense. His body is using purging methods that is caused by irritation of the hairs in his nose. This defense system<span> uses physical and chemical barriers that are prepared to defend the body from infection.</span>
i have no idea... ask google
Size, cost, and safety are things to consider.
"Cleaning can be difficult" is not a sufficient reason to not buy something. It can be a factor, but everything else is to be taken with much more consideration.
I hope this helps!
~kaikers
Pre-clampsia it is called.
