GEOLOGY

Detailed explanation-1: -These ancient arthropods filled the world’s oceans from the earliest stages of the Cambrian Period, 521 million years ago, until their eventual demise at the end of the Permian, 252 million years ago, a time when nearly 90 percent of life on earth was rather suddenly eradicated.

Detailed explanation-2: -They died out at the end of the Permian, 251 million years ago, killed by the end Permian mass extinction event that removed over 90% of all species on Earth. They were very diverse for much of the Palaeozoic, and today trilobite fossils are found all over the world.

Detailed explanation-3: -The last extant trilobites finally disappeared in the mass extinction at the end of the Permian about 252 million years ago. Trilobites were among the most successful of all early animals, existing in oceans for almost 270 million years, with over 22, 000 species having been described.

Detailed explanation-4: -They couldn’t withstand the global warming events set in motion by the volcanic eruptions.

Detailed explanation-5: -Just ask the trilobite. Research published by a Michigan State University paleontologist suggests that an inconsistent molting style, coupled with inefficient physiology, contributed to the demise of these prehistoric relatives of today’s crabs and lobsters nearly 250 million years ago.