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Border guards are the element of a security force include the mission of protecting against internal and external threats.
it is niether because an external is a conflict with others and an internal is a conflict with yourself.
Host defenses that protect against infection include natural barriers. Such barriers are skin, or mucous as an example.
The euglena organism would maintain its internal environment against external fluctuation by regulating its water balance.
Skin, mucous membranes, sloughing of dead skin, tears, sweat, normal microbial flora of skin.
some female dogs that are not spayed may develop Pyometra which is an infection of the uterus. There is 'internal' Pyometra and 'external' Pyometra. With external, the dog will have a smelly discharge (typically after they have been in season). With internal there won't be any discharge and is therefore harder to detect. The condition is very serious and you are racing against time to save the life of your dog. Treatment requires removal of the uterus.
I would say to cause pain and be about sure to cause to be dead.(No defenses against infection, as skin does, among some stuff.)
The politic of today Romania (internal and external) is very bad and against the Romanian people.
All living things have defenses, yes.
Border guards
In "The Old Man and the Sea," the internal conflict is Santiago's struggle with self-doubt and his own limitations as an aging fisherman. The external conflict is his battle against the marlin and the elements of nature as he tries to catch the giant fish.
The conflict in "Ender's Game" is primarily external, as it involves Ender's battles and challenges against the alien Formics (Buggers). However, there are elements of internal conflict as well, particularly in Ender's struggle with his own morality and the consequences of his actions.