Geologic Time Scale Lesson 3 Chapter 12

Multiple Choice

Why is the Precambrian Time considered significant in Earth's history?

• Because it was the time when dinosaurs lived

• Because it covers most of Earth's history and marks the appearance of multicellular organisms

• Because humans first appeared during this time

• Because flowering plants became common

Multiple Choice

Which of the following statements about the Mesozoic Era is correct?

• It was dominated by mammals and flowering plants

• Dinosaurs lived alongside the first mammals, birds, and flowering plants

• All life lived in the oceans during this era

• Humans first appeared during this era