Question

what is the defining feature of a \monoculture\ in agriculture? rotating multiple crops a year relying mostly on human labor using only natural fertilizers planting a single type of crop

Explanation:

Monoculture in agriculture refers to the practice of cultivating a single type of crop over a large area. This is different from rotating multiple crops (which is crop rotation), relying on human labor (which is about labor source), or using natural fertilizers (which is about fertilization method). The key is the "single crop" aspect.

Answer:

planting a single type of crop