D. The percentage of muscle and body fat is often defined as the mass of the body which is why this is taken into account when measuring the BMI for children and teens. It might not use all of the fat, but some parts of it is needed to measure the mass effectively.
I believe 4,000 to 11,000 per microliter of blood.
In adults around 7,000 to 11,000
The answer is D. Environmental
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