Some surplus food a. was traded for other kinds of food.
c. was given away to the poor.
b. was traded for other kinds of goods.
d. was offered to the gods.

b. was traded for other kinds of goods.

Explanation:

c.) biotic: snails; abiotic: temperature climate

congress also has implied powers, which derive from the necessary and proper clause of the constitution and permit congress "to make all laws which shall be necessary and proper for carrying into execution the foregoing powers, and all other powers vested by this constitution in the government of the united states.