Final answer:
The human body contains 25 naturally occurring elements which are essential for its various functions.
Step-by-step explanation:
The total number of naturally occurring elements on Earth is approximately 92, but when considering the human body, there are 31 elements present. These elements are essential for various bodily functions, with some being more abundant than others. The correct answer to the question of how many elements are normally found in the human body is: a. 25.