Final answer:
The Classical Civilizations existed during the Classical Era, which lasted from the fifth through fourth centuries BCE. Unit 3 will likely cover the Hellenistic period.
Step-by-step explanation:
The Classical Civilizations existed during the Classical Era, which lasted from the fifth through fourth centuries BCE. It included Classical Greece, Rome, and other civilizations from that time period. Some key examples of the Classical Age include the Athenian democratic experiment, Greek philosophy by philosophers such as Socrates, Plato, and Aristotle, and the artistic and intellectual achievements of the Greeks.
Based on the timeline provided, Unit 3 will likely cover the Hellenistic period. The Hellenistic period followed the Classical period and lasted from the death of Alexander the Great in 323 BCE to the Roman conquest of Egypt in 30 BCE. It was characterized by the spread of Greek culture and influence throughout the Mediterranean and the merging of Greek and non-Greek traditions.