một đoạn mạch ARN có cấu trúc -A-U-G-X-A-G-X-U-A- viết đoạn gen đã tổng hợp mARN trên và đoạn mạch đó dài bao nhiêu

Matter can be classified into three different states:

Air is a homogeneous mixture (gaseous solution) of N2, O2, H2O, and CO2 gases. ...

Brass is a homogeneous mixture (solid solution) of copper and zinc. ...

Beer is a homogeneous mixture (liquid solution) of H2O, C2H5OH, and a few other substances.

explanation: the line "to save the day, harry must get past a scary three-headed guard dog" from the summary best justifies the conclusion that harry potter and the sorcerer’s stone was influenced by ancient greek mythological literature. the three other choices had nothing to do with ancient greek literature - and the words "three-headed guard dog" are what makes that choice the correct answer.