Final answer:
The most influential dinosaur artist of all time was Charles R. Knight, renowned for his museum murals and the impact on public perception of dinosaurs. Dinosaurs, excluding birds (Aves), were most abundant during the Mesozoic Era, specifically the Triassic, Jurassic, and Cretaceous periods.
Step-by-step explanation:
The most influential dinosaur artist of all time was Charles R. Knight. Knight's work has had a lasting impact on how we visualize prehistoric life, including dinosaurs. His murals, paintings, and illustrations have been featured in natural history museums around the world and have influenced not only subsequent generations of paleoartists but also the public's perception of dinosaurs and other prehistoric animals.
During which geologic time periods were Dinosauria most abundant, excluding Aves? Dinosaurs were most abundant during the Mesozoic Era, which is divided into three periods: the Triassic, Jurassic, and Cretaceous periods. This era is often referred to as the 'Age of Dinosaurs'. The Mesozoic Era spanned from about 252 to 66 million years ago, and it was during this time that dinosaurs became the dominant terrestrial vertebrates.