Talk to your parents why we do not see many sparrows in and around our house​

Scientists consider mobile radiation the major culprit for the disappearance of sparrows. Birds navigate by sensing the earth's magnetic fields and mobile radiations are known to disturb them and interfering with bird's ability to move around. so we don't find any sparrows in and around our house. hope this helps you.

d. air pressure decreases as altitude increases.

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