For adults, obesity is defined as:
a. weighing more than your height in inches multiplied by 2.
b. being over 200 pounds.
c. being at least 20% over one's ideal body weight.
d. all of the above

The correct answer is C, Being at least 20% over one's ideal body weight.

Explanation:

Ideal body weight is generally seen by analyzing the Body Mass Index of a person. This BMI is the ratio of person's weight in kilograms to its height in feet and inches. There are ranges of BMI in which people are categorized according to the weight and height ratio. If a person's BMI is above 30, they are in the obese category.

But according to this question, 20% overweight means adults are towards obesity.  

relationship between pressure and air volume and led to the understanding of how respiration works; i believe this is the correct answer ; /// good luck