A chemically bond is defined as the invisible force between two atoms which together forms a molecule. Chemical bonds are of different types - covalent bond and ionic bond. These bonds are formed between the atoms because of a chemical reaction.
In a chemical reaction, different reaction intermediates are formed which leads to the formation of new forces of attraction between nearby atoms or ions to form new bonds. Thus chemical bonds are formed from chemical reaction.
<span>Epidemiology is a branch of science that studies diseases. Epidemiology
seek to answer ‘who, when, where’ in order to analyze health and disease and
find out the cause of illnesses. They rely on other allied professions like
Biology, Social Sciences and Engineering in order to make better assessment on
studies. </span>
