Which most closely defines the basal metabolic rate?

a: the number of calories body uses at the rest
b: the number of calories the body uses during aerobic exercise
c: the number of calories the body uses during anaerobic exercise
d: the number of calories the body uses minus the daily calorie comsumption

answer needed !

Transposon can cause mutations in genes at or near the site of transposon insertion. it is possible for these elements to transpose away from their original site, causing a reversion of the mutant phenotype. in some cases, however, even more severe phenotypes appear when these elements excise from this site, due to events at or near the mutant allele. what might be happening to the transposon or the nearby gene to create more severe mutations?