Foreign bodies can be in hollow organs (like swallowed batteries) or in tissues (like bullets). They can be inert or irritating. If they irritate they will cause inflammation and scarring.
Foreign material that is added to air or bodies of water are called pollutants. Examples would be smog, oil, smoke, and trash.
A foreign body is called any intruding object originally originated from outside the own body. They can be swallowed or get into the own body from the rectum. Another possibility to enter would be by airways. Some examples of foreign bodies include coins or batteries.
As you do not state which country you are from we cannot say who is 'foreign'.
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oceans,lakes, lochs, dams, tarns and puddles are some examples of bodies of water.
Placing the bodies of the dead into a deathstill, or using a stillsuit.
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Pain, hearing loss, and a sense of something stuck in the ear are symptoms of foreign bodies in the ears.
Decapods (Lobsters, crabs etc.) are examples of invertebrates that have shells or chitinous bodies that protect their bodies.
Most of the proteins from other sources like plants or plant products or from insect sources are considered foreign bodies(though there are several other foreign bodies). They can be used to study immune mechanisms, and to create new drugs for immunity related diseases.
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Some bacteria's are foreign to our bodies and therefore can make humans unwell. Our white blood cells are designed to attack foreign or unwanted bacteria