During which period did mammals first appear?
User: During which period did mammals first appear? a. Pleistocene b. Carboniferous c. Cretaceous d. JurassicWeegy: Mammals first appeared during Jurassic period. Expert answered|jin_jae_min|Points 408|User: Biomes on Earth have exhibited changes throughout history that have been caused by a variety of factors. B. Triassic.-The first true mammals appeared in the Late Triassic, 200 million years ago, over 70 million years after the first therapsids and approximately 30 million years after the first mammaliaformes. Carboniferous c. Cretaceous d. JurassicWeegy: Mammals first appeared during Jurassic period. Expert answered|jin_jae_min|Points 408|User: Biomes on Earth have exhibited changes throughout history that have been caused by a variety of factors. Pleistocene b. Carboniferous c. Cretaceous d. JurassicWeegy: Mammals first appeared during Jurassic period. Expert answered|jin_jae_min|Points 408|User: Biomes on Earth have exhibited changes throughout history that have been caused by a variety of factors. The truth, though, is very different: in fact, the first mammals evolved from therapsids (mammal-like reptiles) at the end of the Triassic period, and coexisted with dinosaurs throughout the Mesozoic Era. The Jurassic. Mammals evolved continuously from the early synapsids of the Paleozoic to modern mammals, but the first mammals that are considered true mammals appeared in th … e Jurassic. 12 people found this useful. 1  Fascinating Facts About Reptiles Reptiles make up over 8,000 species world wide. As mentioned above, the first mammals evolved toward the end of the Triassic period from therapsids, the line of mammal-like reptiles that arose in the early Permian period and produced such uncannily mammal-like beasts as Thrinaxodon and Cynognathus. This period started 248 million years ago and finished 213 million years. This period was the beginning of the Mesozoic era. Life in the Triassic Period Dinosaurs and other reptiles became the dominate land animals. Frogs appeared and later the first tortoises, turtles and crocodiles. Confidence votes 2.9K. The Jurassic. Mammals evolved continuously from the early synapsids of the Paleozoic to modern mammals, but the first mammals that are considered true mammals appeared in the Jurassic. This period was the beginning of the Mesozoic era. Life in the Triassic Period Dinosaurs and other reptiles became the dominate land animals. Frogs appeared and later the first tortoises, turtles and crocodiles. The first mammals appeared.
Late Triassic period