Skin
mucus in your nose
hairs on the inside of your trochea and nose
saliva
poo head
They do not stop it but the mucus and motion of the cillia remove said microbes and dust should they get into the lungs.
whashing offten
one way is the nose ,the hair and the mucous in a person's noes prevents microbes from getting in by trapping them.
your stomach acids fight it off and they kill the microbes. in a way this is good and bad because if it kills the bad microbes then it kills the good microbes in our body aswell!
White blood cells
Tides are primarily caused by the gravitational pull of the moon and the sun. There is nothing that can completely stop tides, as they are a natural phenomenon driven by celestial bodies. However, man-made structures like dams and barriers can influence tidal patterns in localized areas.
It is not possible to completely stop lava flow using barriers. However, barriers can be used to redirect the flow or slow it down by creating obstacles in its path. Cooling the lava with water or earth-moving equipment can also help in managing lava flows.
There are many barriers that may stop the flow of communication in international areas. Different languages and a time difference can delay or stop international communications.
Eat beans and fart regularily. Honestly , there's a constant exchange of microbes, bacteria, fluides and gasses between the insides and outsides of your body. A couple of microbes will not change a thing if your immune system is not compromised ...
yes. they contain antibodies which are vital in washing away germs and other pathogens and they stop microbes from infecting the cornea and other parts of the eye. they also wash away potentially infected foreign bodies from inside your eye.
Rats are Vermin creatures, who feed of the dead bodies of people who have died in war. Dead bodies in the trenches had to be taken far away to stop the rats coming to the trenches. All the soldiers hated the rats and used to beat them with spades for entertainment.