Receptor cells are most responsive to changes in stimulation, constant stimulation is not effective in producing a sustained reaction. This explains why we can misplace our sunglasses that are sitting on top of our head. What is the reason for this?

Sensory nerve receptors are not able to send out messages to the brain indefinitely.

Explanation:

Receptors can be defined as protein molecules that are located inside the target cell or on its surface that receive a chemical signal. Chemical signals are released by signaling cells in the form of little, usually volatile or soluble molecules known as ligands. A ligand is a molecule that binds another specific molecule, in some cases, transporting a signal in the process. Ligands can therefore be described as signaling molecules. Ligands and receptors exist in several forms; however, a specific ligand will have a specific receptor that typically binds with only that ligand.

The loss of sun glasses on top of our head is due to the fact that the sensory nerve receptors are not able to send out messages to the brain indefinitely.

answer///multiple alleles;

yes, because even though a theory has a  lot of evidence to support it, it is not always true