1 Ghrelin is a fast-acting hormone that plays a vital role in meal initiation and contributes to weight gain.  Leptin mediates long-term regulation of energy balance and suppresses food intake, thereby inducing weight loss.
For the military, as for the civilian world, it is not overstating the point to say that the advent of radio communications has changed almost everything. The meerkat or suricate is a small mammal and a member of the mongoose family.
To excel is to achieve a level higher than another or others: excelled the other speakers in wit and eloquence. To surpass is to go beyond another in performance, quality, or degree: a marathoner who surpassed his previous record; a picture quality that far surpassed that of earlier models.