Question

_____ have valuable contributions in the green revolution in the USA.

Answer 1

Answer:

Green revolution is answer

Answer 2

Answer:

Green revolution, great increasing the production

of food grains (especially wheat and rice) that reult in the large part from the introduction into developing countries of new, high-yielding varities, beginning I. the mid-20th century. it's early dramatic successes were in Mexicoand the Indian subcontinent