New Sugyah in Pesach NOV 9TH

What mitzvah is being referred to in the first pasuk quoted in the sugyah? Please give detail.

What does Rava hold is the level of obligation of the mitzvah of Matzah on the Seder night in our day (when there is no Bais Hamikdash)?

What does Rava hold is the level of obligation of the mitzvah of Maror on the Seder night in our day (when there is no Bais Hamikdash)?

What does Rav Acha hold is the level of obligation of the mitzvah of Matzah on the Seder night in our day (when there is no Bais Hamikdash)?

What does Rav Acha hold is the level of obligation of the mitzvah of Maror on the Seder night in our day (when there is no Bais Hamikdash)?

What does Rava say is the reason that Maror is only d'rbanan in our day?

What קושיא/question does the Gemara ask on Rava's reasoning?

What is Rava's answer? How does he explain the difference between Matzah which is d'oraisa, and Maror, which is d'rabanan?

The Gemara then explains why Rav Acha does not agree with Rava. How does Rav Acha explain the second pasuk בערב תאכלו מצות?

Why does Rava not agree with this drasha of Rav Acha?