Different microscopic organisms cause different diseases. when a dangerous microscopic organism is transferred from one person to many people, the disease it carries will spread.

why is this considered a theory instead of a hypothesis or a law?

a. it is a statement of fact about how nature works instead of an explanation.
b. it provides an explanation for many observations and accepted hypotheses.
c. it describes how to test a possible explanation of one specific relationship.
d. it has not changed over time even though new technology has been developed.

number of electrons for neutral cl

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