When species are put on the Endangered Species List they are protected by the government from hunting in order to prevent extinction. Endangered species are usually put in "sanctuaries" where they are monitored and allowed to breed, increasing their population before being released into the wild. Hope this helps!
Fossils in upper were younger than fossils in lower levels. Hope this helps!
It could form an ionic bond with Fluorine or Chlorine. (There are many others that it could as well but those are the most basic)
