The most adundant element in the body of organisms and outside environment is

Answer: Option C

The most abundant element in the body of organisms and the outside environment is Oxygen.
Carbon, hydrogen, oxygen and nitrogen are the most important elements. Small quantities of other elements are necessary for life.
Oxygen is the most common element in the human body, comprising approximately 65.0% of body mass. Most of the oxygen present is found in the form of water.