Abbreviation BMR in biology stands for

Concept: The basal metabolic rate (BMR) is the rate of vitality consumption per unit of time by endothermic creatures at rest. 

It is detailed in vitality units per unit time extending from watt (joule/second) to ml O2/min or joule per hour per kg body mass J/(h·kg). Appropriate estimation requires a strict set of criteria to be met. It is a gauge of calories burnt by the person beneath rest for 24 hours. The least sum of vitality required to preserve the customary work of the body is BMR.

Therefore, the abbreviation BMR in biology stands for Basal metabolic rate.

Hence, the correct answer is option B.