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.
The Devils Hole pupfish is the smallest desert pupfish species in the genus Cyprinodon. Devils Hole pupfish are less than 25 millimeters (1 in) long and resemble other pupfish in shape.They are the smallest of the desert pupfish species, averaging 19 millimetres (0.75 in) in length. They lack pelvic fins and have large heads and long anal fins.he Devils Hole pupfish is the smallest desert pupfish species in the genus Cyprinodon. Devils Hole pupfish are less than 25 millimeters (1 in) long and resemble other pupfish in shape.