A student creates a model of a closed ecosystem by filling a glass tank half
full with water, then adding 10 snails and two small aquatic plants. The next
day, all the snails are dead. What is the most likely cause of their death?
A. The amount of nitrogen in the tank became too low.
B. The amount of nitrogen in the tank became too high.
O
C. The amount of oxygen in the tank became too high.
D. The amount of oxygen in the tank became too low.

Where did washington’s army spend a harsh and difficult winter in 1777–1778?

Select the correct answer. when alexander the great ruled his empire, he spread greek culture and increased his empire's wealth. along the way, he founded many cities, most of which he named after himself. review the following map. how did alexandria's location affect trade? a. it forced people to rely on shipping to trade with other nations. b. it brought together people from the west and east for trade. c. it led to conflicts between regions of the empire. d. it forced people to pay tribute to alexander as their leader.

Whose on-field leadership is responsible for the success of the united states in the battle of new orleans during the war of 1812?