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.
Narwhal Endangerment Level. Narwhals have been listed as âNearly Threatenedâ since 2008. Very few laws have been proposed in attempts to protect this interesting species. In an effort to support conservation, the European Union established an import ban on tusks. Narwhals are becoming extinct for three main reasons.housands of years of evolution have prepared an Arctic species like the narwhal for life on and around the sea ice. Because of climate change, this ice cover has dramatically decreased in both extent and thickness, at a rate far too quick for a species to adapt.