Save. teachpe.com. On the surface, human bones---especially dead ones---seem to be made of rigid material. However, the make-up of bones is quite complex--they are alive, growing and changing connectors in the human body. Bones are not completely solid, but rather a mixture of elements that range from soft to hard.
Kept under lock and key, the Devils Hole pupfish (Cyprinodon diabolis) has teetered on the brink of extinction since it made the federal list of endangered species in 1967.his poses a risk to the shrinking pupfish population, however. To reduce the impact of the egg collection, biologists should gather pupfish eggs in the fall, when the fish population is larger, rather than in the spring, according to the new study, for which a scientist analyzed the extinction risks for the pupfish.
Description: Pupfish are ray-finned fish with have striking coloration. The Devils Hole pupfish (Cyprinodon diabolis), for example, is bright blue with purplish accents.The White Sands pupfish has yellow and orange fins. Size: Most pupfish are very small, some less than an inch in length.Diet: Pupfish feed on algae, plants, aquatic invertebrates, and insects.ife History and Reproduction: The Devils Hole pupfish lives in a relatively constant habitat, so it can breed year round. The mating system is polygynous, and males may prevent other males from breeding with a female. When larvae hatch, they are less than a centimeter long.