27 In fact, a CDC analysis of flu vaccine effectiveness for the past decade â from 2005 to 2015 - demonstrated that more than half the time, seasonal flu shots are less than 50 percent effective! In 2004-2005, the flu shot failed 90 percent of the time, 28 and last year failed 77 percent of the time. 29 Estimates for flu shot effectiveness this year is a not very impressive 59 percent. 30. Public Health Doctors Push Ineffective, Reactive Flu Vaccine
Active transport is a method of cell transport that requires energy. Energy is expended because the cell has to move materials from an area of low concentration to an area of high concentration. Imagine you have 5 large marshmallows in your mouth.
Active transport is the movement of molecules across a membrane requiring energy to be expanded by the cell. <br /><br /> ACTIVE TRANSPORT REQUIRES ENERGY. <br /><br /> Passive transport is diffusion across a membrane requiring only random motion of molecules with no energy expanded by the cell.