The
ratio of body weight to height is represented as Body Mass Index (BMI).
<span>The
BMI is defined as the body mass divided by the square of the body height, of (kg/m2).
By calculating the BMI of an individual you can classify it into categories
like underweight, normal weight, overweight, or obese.</span>
Do you mean organisms as in plants? If so then it would be Photosynthesis.
<span> The main source of energy for humans is the food we eat.</span>
31 pairs
Spinal nerve, in vertebrates, any one of many paired peripheral nerves that arise from the spinal cord. In humans there are 31 pairs: 8 cervical, 12 thoracic, 5 lumbar, 5 sacral, and 1 coccygeal. Each pair connects the spinal cord with a specific region of the body.