Question

which would increase the amount of dissolved oxygen in a pond?○ removing fish○ both b and c are correct○ removing plants○ adding plants

Explanation:

Aquatic plants produce dissolved oxygen via photosynthesis, increasing pond oxygen levels. Removing fish reduces oxygen consumption but does not actively increase oxygen. Removing plants eliminates a key oxygen source, lowering levels. Thus, only adding plants and removing fish (matching the "Both B and C are correct" option if we map: B=Removing fish, C=Adding plants) increases dissolved oxygen.

Answer:

Both B and C are correct