Projections of population growth. World population estimates from 1800 to 2100, based on high, medium and low United Nations projections in 2015 and UN historical estimates for pre-1950 data.
Answers. Best Answer: Cell-to-Cell communication is absolutely essential for multicellular organisms. The billions of cells of a human or an oak tree must communicate in order to develop from a fertilized egg and then survive and reproduce in turn.Communication among cells is also important for many unicellular organisms that must locate food and find mates in order to sexually reproduce.he process by which a signal on a cell's surface is converted into a specific cellular response, a series of steps called a signal-transduction pathway, has been extensively studied in many types of cells.
Cells release chemicals to the environment, and other cells may then learn about the presence of other cells and react appropriately to the chemical signals. Communication between cells probably evolved pretty early in the history of life. Source(s): http://www.sciencedaily.com/releases/200...embrane receptors allow cells to recognize, transmit, and respond to a variety of specific signals. A technical definition I found is: Cell Signaling-all living cells sense and respond to their enviroment by a set of mechanisms known as cell signaling.