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.
Communication between neurons (with a few exceptions in mammals) is a chemical process. When the neuron is stimulated, the electrical signal (action potential) travels down the axon to the axon terminals.When the electrical signal reaches the end of the axon, it triggers a series of chemical changes in the axon terminal.he neuron has processes called dendrites that receive signals and an axon that transmits signals to another neuron. The cell body, also called the soma, is the metabolic center of the neuron. The nucleus is located in the cell body, and most of the cellâs protein synthesis occurs in the cell body.