Answer: Cold chilling frosty
Explanation:
Many Native Americans in the Great Lakes - St. Lawrence Lowlands planted various crops such as maize. The correct option among all the options that are given in the question is the fourth option or option "d". I hope that this is the answer you were looking for and it has come to your help.
One effect that plentiful harvests had on ancient civilizations of the mainland's river valleys was to help have larger populations and the need to have materials to survive.
