Researchers have found a remarkable effect while studying how marine particles sink, which could affect the way scientists assess global carbon fluxes.
Ammonites are an group of marine animals of the subclass Ammonoidea in the class Cephalopoda. They are excellent index fossils, and it is often possible to link the rock layer in which they are found to specific geologic time periods.mmonites are an group of marine animals of the subclass Ammonoidea in the class Cephalopoda. They are excellent index fossils, and it is often possible to link the rock layer in which they are found to specific geologic time periods.
By Laura Klappenbach. Amniotes (Amniota) are a group of tetrapods that includes birds, reptiles, and mammals. There are about 25,000 species of amniotes alive today. Amniotes appeared and diversified during the late Paleozoic era. Amnoites lay eggs that are well-adapted to survive in a terrestrial environment.