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Bacteria are helpful because they produce oxygen, which our bodies need to breathe, and they help us to digest the food we eat. Bacteria are also helpful because they are used in medicine to help us overcome disease. Bacteria are harmful because they can cause tooth decay and illnesses that can be either common or quite serious.
<span>epidemiological studies</span>
Adhesion is defined as a component of water , an attraction that occurs between two different substances like water and the cell walls of plant cells.
For instance:
A tree requires to be able to transport water from the roots to the leaves atop the tree over a long distance. The Water molecules will stick to the xylem in the method called as adhesion.
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