Letâs start with military unmanned aircraft. According to the annual almanac published by the Air Force Association (http://www.airforcemag.com/Magaz...), as of mid-2016: MQ-1 Predators: 268 produced, 139 in service, 111 destroyed in accidents; MQ-9 Reapers: 346 (including those as yet undelivered), 165 in service, 24 destroyed in accidents
Secretion is the process of elaborating, releasing, and oozing chemicals, or a secreted chemical substance from a cell or gland.In contrast to excretion, the substance may have a certain function, rather than being a waste product.ecretion is the process of elaborating, releasing, and oozing chemicals, or a secreted chemical substance from a cell or gland.
salivary gland. Kidney (corpuscles and tubules) In contrast, the secretory units of the kidney, called renal corpuscles, comprise a relatively small proportion of the kidney. The bulk of the kidney consists of highly specialized tubules, which correspond to the duct tree of a typical gland. Together, the renal corpuscle and its associated tubule is called a nephron.