Answer: The question is incomplete, below is the complete question.
Blood sugar levels rise and fall in response to various factors including when one last ate. Dr. Jones wants to measure participants’ glucose levels over the course of a two-week treatment protocol. She arranges for participants’ blood to be drawn every morning, between 6:00 a.m. and 8:00 a.m., before the participants consume breakfast. She is exerting which type of control?
A) Randomization
B) Constancy
C) Elimination
D) Random assignment
The correct answer is CONSTANCY.
Explanation: in a healthy individual,blood glucose level reaches not more than 170mg/dL ad a maximum concentration between 30 and 60minutes and goes down to it's initial value after one hour.
The constancy of this blood glucose level shows the existence of regulatory mechanisms that ensures it's maintenance with narrow limits and this is exactly what Dr Jones wants to measure.
