The correct answer is (d.) a place where Muslim philosophers met to contemplate life. The House of Wisdom was actually a major intellectual center for well-known scholars during the Golden Age that made many remarkable contributions to the diverse fields.
Photosynthetic prokaryotes caused aerobic atmosphere during the history of Earth.
The trans-continental railroad was completed around this time, so not only did train travel change, but was innovated so that a train could take you anywhere across the US.
Answer:Nobility and people that weren't nobility but had a lot of land
Explanation:
