Cells in a large multicellular organism communicate with each other by chemical signals. these signals are passed from one cell to another. to receive and respond to a chemical signal, a cell must have a that chemical.

Cells in a large multicellular organism communicate with each other by chemical signals. These signals are passed from one cell to another. To receive and respond to a chemical signal, a cell must have a receptor for that chemical.

Explanation:

To generate a physiological response, all cells in the body have special proteins called receptors. These receptors are involved in detecting a chemical signal and generating a response. The receptors are specific for different kind of chemical signals. For example, a dopamine receptor will bind a dopamine molecule whereas an insulin receptor will be able to bind an insulin molecule. Apart from chemical signals, some cells might also respond to mechanical signals.

i believe it would cause an increase of percipitation, though i could be wrong. so i would say b is the answer.