Weegy: Sir/Madam the answer is letter B. Triassic User: During which periods did dinosaurs exist? Select all that apply.
Weegy: A. Trassic User: The Phanerozoic eon began at the same time as which of these? Select all that apply.
A. the start of the Paleozoic era
B. the start of the Cambrian period
C. the end of the Proterozoic eon
D. ... (More)