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.
Additionally, proteins are responsible for enzyme production (which helps to speed up metabolic processes), and the growth, maintenance and repair of body cells. They also provide structural support, and assist in the transport of substances in and out of the cell.riglycerides are an efficient form of energy storage that can be mobilized when fuel is needed. *Transmission of information in cells (signal transduction). Lipid hormones, like steroids and eicosanoids, also mediate communication between cells.