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.
Devils Hole, in the Mojave Desert, will also likely become less hospitable to the pupfish as climate change continues to warm the planet, he said.The new research found that increasing temperatures will likely reduce the pupfish's optimal recruitment period by another two weeks by mid-century.evils Hole, in the Mojave Desert, will also likely become less hospitable to the pupfish as climate change continues to warm the planet, he said.