The civil war began in April 12, 1861 and ended in May 9, 1865. The war was fought for over 4 years.
I did a little research and it looks like the answer is A.
Answer:
Alligator Carcasses
Explanation:
Scientists who dropped alligator carcasses onto the ocean floor to see how deep-sea creatures would respond were surprised to find the reptiles were devoured within hours. The experiment also led to the team discovering a new species of worm.
The CHIEF COMPLAINT is a statement describing the reason for the encounter and is a history element.