What does a milpa contain?
B. just corn
many crops
C. just beans
D. beans and corn​

b is your answer

Explanation:

A milpa is a field, usually but not always recently cleared, in which farmers plant a dozen crops at once including maize, avocados, multiple varieties of squash and bean, melon, tomatoes, chilis, sweet potato, jícama, amaranth, and mucuna Milpa crops are nutritionally and environmentally complementary.

Explanation:

c.) biotic: snails; abiotic: temperature climate