D-walls and doors would represent the cell membrane

An image is formed due to reflection of light by a plane mirror. In a completely dark room there is no light so no image will be formed by the mirror placed in the room. Hence we will not be able to see our image in a mirror placed in a completely dark room.
Answer:
The correct option is;
A. If snack are wrapped in aluminium foil, then the snacks will not be eaten by seagulls
Explanation:
It has been observed severally that birds including seagull tend to avoid shiny objects. As have been proven by research, birds are not drawn towards shiny materials and shiny articles can be used to scare off birds. Articles like CDs, plates of aluminium and tinfoil and be arranged so as to be glaring in order to ward of the birds
Similarly, placing shinny articles around a property keeps away.
It is sensors :) i hope this helped you :)
Answer:
Your answer is B,Clay.
Explanation:
Silt is the name of a sediment grain that range in size from 0.625 mm to 0.0039 mm. Mud is the smallest grain size and is also known as clay.