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which example gives all the necessary information to describe motion scientifically
1. the batter hit the ball into the stands at 90 m/s
2. a fan watched the length of the 130-m field for his favorite player
3. the first baseman was told to throw the ball quickly
4. the catcher held the fly ball in his glove for several minutes

electromagnetic shielding is the practice of reducing the electromagnetic field in a space by blocking the field with barriers made of conductive or magnetic materials. shielding is typically applied to enclosures to isolate electrical devices from their surroundings, and to cables to isolate wires from the environment through which the cable runs. electromagnetic shielding that blocks radio frequency electromagnetic radiation is also known as rf shielding.

the shielding can reduce the coupling of radio waves, electromagnetic fields and electrostatic fields. a conductive enclosure used to block electrostatic fields is also known as a faraday cage. the amount of reduction depends very much upon the material used, its thickness, the size of the shielded volume and the frequency of the fields of interest and the size, shape and orientation of apertures in a shield to an incident electromagnetic

from wikipedia

the answer you are looking for is d. there are no holes for blood to enter or leave the system. your welcome