What is the name for the level of crop output from a given level of input? A. Green revolution
B. Yield
C. Monoculture
D. Productivity

How has the geography of india made it difficult for its people to expand before modern technology?

What is the only country that borders portugal

Seasons are a result of: a.) earths rotation on its axis b.)earths tilt on its axis c.) global air circulation patterns d.) global humidity circulation patterns