Seller is obliged to deliver the horse named Black to Buyer on March 20. Answer the question and provide a concrete explanation in each of the following item in terms of:

1. If Black died on March 18 without the fault of Seller, what happened to his obligation?

2. If Black died because Seller were not able to feed it for a week, what happened to his obligation?

3. What if Seller failed to deliver the horse on March 20 and Buyer did not demanded the fulfillment of the obligation, and Black died on March 23 without debtor's fault. Is Seller's liability be extinguished? What type of delay Seller committed? What are the rights of Buyer? Is he entitled for damages?