Title: Hellenistic period.
Question: Who saved Lysimachus in Phrygia?

Title: Incandescent light bulb.
Question: What is the powdery substance in coated glass light bulbs?

Title: Hellenistic period.
Question: When was the Kingdom of Pontus taken over by the Roman Republic?

Title: Annelid.
Question:
What do annelid eggs become?