The prokaryotic organisms mainly include bacteria. Their length is only few micrometers long. There are so many shapes that a bacteria possess and the can be sphere or rods and spirals. They can be present at any p-lace ranging from soil, water, acidic springs, radioactive waste, etc. sometimes deep inside the earth. Journal Article is sometimes called a Scientific Article, a Peer-Reviewed Article, or a Scholarly Research Article. Together, journal articles in a particular field are often referred to as The Literature. Journal articles are most often Primary Research Articles. However, they can also be Review Articles. These types of articles have different aims and requirements. Sometimes, an article describes a new tool or method. Because articles in scientific journals are specific, meticulously cited and peer-reviewed, journal databases are the best place to look for information on previous research on your species. Without a background in the field, journal articles may be hard to understand - however, you do not need to understand an entire article to be able to get valuable information from it.