who was the president when alaska was purchased???

Answer: Andrew Johnson

Question: the geological term caldera comes from the spanish word for?

Answer: cooking pot

Answer this question: what port is associated with the dns service??

53

Q: all call of duty games for playstation 3?A: Advanced Warfare

Input: name the type of enzyme used to produce the cdna?

Output: reverse transcriptase

Input: who topped the forbes world's billionaires list 2017?

Output:
Microsoft founder Bill Gates