Enterobacter is a genus of common Gram-negative, facultatively anaerobic, rod-shaped, non-spore-forming bacteria of the family Enterobacteriaceae.nterobacter is a genus of common Gram-negative, facultatively anaerobic, rod-shaped, non-spore-forming bacteria of the family Enterobacteriaceae.
Trilobite fossil from the Cambrian Period. Photo Credit: Archbob. The first period in the Paleozoic Era is known as the Cambrian Period. Many of the ancestors of the species that have evolved into what we know today first came into existence during the Cambrian Explosion in the early Cambrian Period.
User: The Paleozoic Era is the longest time period in the history of Earth. true or falseWeegy: The Paleozoic Era is the longest time period in the history of Earth. Answer is TRUE. Expert answered|samth007|Points 27|.ser: The Paleozoic Era is the longest time period in the history of Earth. true or falseWeegy: The Paleozoic Era is the longest time period in the history of Earth. Answer is TRUE. Expert answered|samth007|Points 27|.