I really need to know what the answer is as well I am super confused
Sampling, mark and recapture, indirect observation, and direct observation
The growing season in the interior plains is roughly "five to seven months" long, although it should be noted that this is not a "rigid" timetable, and sometime the season spans beyond these limits.
Paper from the Tang/Song dynasty to the Islamic empire, also because of that the Islamic empire has adapted paper money that is originated from China