Harold Nathan Braunhut (March 31, 1926 – November 28, 2003), also known as Harold von Braunhut, was an American mail-order marketer and inventor, most famous as the creator and seller of both the Amazing Sea-Monkeys and the X-Ray Specs.
 His grandfather, Tobias Cohn, was head of the T.Cohn Toy Company until the early 1940s.
United Kingdom Special Forces Selection is the selection and training process for members of the United Kingdom's three Special Forces formations: 22 Special Air Service, Special Boat Service, and Special Reconnaissance Regiment.
 Members of the SAS and SBS undergo common selection up to the award of a sand-coloured beret to SAS Troopers whereupon SBS candidates undergo further selection to qualify as Swimmer Canoeists and SAS personnel undergo further specialist training.
 Until the late 1990s candidates for the SAS and SBS underwent selection under the auspices of the prospective unit.
Metamorphosis is a biological process by which an animal physically develops after birth or hatching, involving a conspicuous and relatively abrupt change in the animal's body structure through cell growth and differentiation.
 Metamorphosis is iodothyronine-induced and an ancestral feature of all chordates.
 Some insects, fishes, amphibians, mollusks, crustaceans, cnidarians, echinoderms, and tunicates undergo metamorphosis, which is often accompanied by a change of nutrition source or behavior.
 Animals that go through metamorphosis are called metamorphoses .
 Animals can be divided into species that undergo complete metamorphosis ("holometaboly"), incomplete metamorphosis ("hemimetaboly"), or no metamorphosis ("ametaboly").
Eugen von Daday or Jenő von Daday (1855–1920) was a Romanian professor of zoology in Hungary in the late 19th and early 20th century.
 Daday was an expert on aquatic invertebrates, particularly crustaceans. Daday collected and identified many species and genera within the borders of the Hungarian empire, and received samples of invertebrates from collectors around the world.
 After his death in 1920, Daday's collection of crustaceans was acquired by the Hungarian Natural History Museum.
Carcinology is a branch of zoology that consists of the study of crustaceans, a group of arthropods that includes lobsters, crayfish, shrimp, krill, barnacles and crabs.
 Other names for carcinology are "malacostracology", "crustaceology", and "crustalogy", and a person who study crustaceans is a carcinologist or occasionally a "malacostracologist", a "crustaceologist", or a "crustalogist".
The term shrimp is used to refer to some decapod crustaceans, although the exact animals covered can vary.
 Used broadly, it may cover any of the groups with elongated bodies and a primarily swimming mode of locomotion – most commonly Caridea and Dendrobranchiata.
 In some fields, however, the term is used more narrowly, and may be restricted to Caridea, to smaller species of either group, or to only the marine species.
 Under the broader definition, "shrimp" may be synonymous with prawn, covering stalk-eyed swimming crustaceans with long narrow muscular tails (abdomens), long whiskers (antennae), and slender legs.
 Any small crustacean which resembles a shrimp tends to be called one.
 They swim forward by paddling with swimmerets on the underside of their abdomens, although their escape response is typically repeated flicks with the tail driving them backwards very quickly.
 Crabs and lobsters have strong walking legs, whereas shrimp have thin fragile legs which they use primarily for perching.
Harold von Mickwitz ("né" Paul Harald von Mickwitz; 22 May 1859 — 12 February 1938) was a Finnish-born American concert pianist and composer who had been head the piano departments of conservatories in Germany and the United States.
Sea-Monkeys is a brand name for brine shrimp—a group of crustaceans that undergo cryptobiosis—sold in hatching kits as novelty aquarium pets. Developed in the United States in 1957 by Harold von Braunhut, the product was heavily marketed, especially in comic books, and remains a presence in popular culture.
 May 16 is National Sea-Monkey Day in the United States.
In biology, co-adaptation, or coadaptation is the process by which two or more species, genes or phenotypic traits undergo adaptation as a pair or group.
 This occurs when two or more interacting characteristics undergo natural selection together in response to the same selective pressure or when selective pressures alter one characteristic and consecutively alter the interactive characteristic.
 These interacting characteristics are only beneficial when together, sometimes leading to increased interdependence.
 Co-adaptation and coevolution, although similar in process, are not the same; co-adaptation refers to the interactions between two units, whereas co-evolution refers to their evolutionary history.
 Co-adaptation and its examples are often seen as evidence for co-evolution.
Profilicollis is a genus of acanthocephalan parasites of crustaceans.
 The status of the genus "Profilicollis" has been debated, and species placed in this genus were formerly included in the genus "Polymorphus".
 However, research on the morphology of the group and their use of hosts has concluded that "Profilicollis" and "Polymorphus" should be regarded as distinct genera, and species previously described as "Polymorphus altmani" are now referred to as "Profilicollis altmani" in the literature.
 "Profilicollis" parasites infect decapod crustaceans, usually shore crabs, as intermediate hosts, and use many species of shorebirds as definitive hosts.

Question: Harold von Braunhut was the creator and marketer of a group of crustaceans that undergo what process?
Answer: cryptobiosis