Two ecosystems, X and Y, were investigated and compared. They are the same age, and each has an identical climate. The comparison results are given in the table. From the information in the table, which statements are reasonable suggestions about X and Y?
- A2 and 4 only
- B1, 2 and 3 only
- C1, 3 and 4 only
- D1, 2, 3 and 4