This document/cartoon is a<span> secondary source because it is most likely something someone drew after whatever event that took place and was not by someone involved in the event.
A primary source is a source created by the person/people involved in a historical event. This includes things like: </span><span>artifacts </span><span>documents </span>diaries <span>manuscripts </span>etc...
A secondary source is one that was created by somebody that was not involved in a historical event and are generally things like articles and textbooks.
<span>Simple diffusion and facilitated diffusion both allow molecules to cross the cell membrane without any expenditure of energy by the cell. </span>
