In chemistry, an amphoteric compound is a molecule or ion that can react both as an acid as well as a base. Many metals (such as copper, zinc, tin, lead, aluminium, and beryllium) form amphoteric oxides or hydroxides. Amphoterism depends on the oxidation states of the oxide. AlO is an example of an amphoteric oxide.
can a compound be both an acid and a base?
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Answer: yes

Now free from the stress of the murderer, Strike decides to repair his relationship with Robin by attending her wedding, the invitation to which was never formally rescinded following her dismissal. After a frantic dash to the church, Strike arrives just in time to see Robin and Matthew exchange vows. The novel ends as Robin looks into the room full of wedding guests, sees Strike, and beams.
did robin marry matthew at the end of career of evil?
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Answer: yes

Constantine is an American television series developed by Daniel Cerone and David S. Goyer for NBC, featuring the DC Comics character John Constantine. Matt Ryan stars as Constantine, a British exorcist and occult detective who actively hunts supernatural entities. The series aired from October 24, 2014 to February 13, 2015, over 13 episodes. On May 8, 2015, NBC canceled Constantine after only one season due to poor ratings.
is there going to be a season 2 of constantine?
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Answer:
no