Cells in the Interior of Complex Multicellular Organisms Are Able

Cells in the interior of complex multicellular organisms are able to respond to environmental signals through:

A) receptors designed to detect directly changes in the external environment.
B) diffusion of environmental cues through the outer layers of the body.
C) receptors for signals sent from exterior cells that relay information about environmental changes.
D) pH, temperature, or osmolarity receptors in the membranes of interior cells.