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.
A surrogate key is any column or set of columns that can be declared as the primary key instead of a real or natural key. Sometimes there can be several natural keys that could be declared as the primary key, and these are all called candidate keys.So a surrogate is a candidate key.