Q:

A teacher wants to discuss various ecosystems in her classroom, which of the following examples are most appropriate :

(A) Desert

(B) River

(C) Ocean

(D) Algae / Coral Reef

• 1
  (A) (B) and (C) (D)
• 2
  (B) (C) and (D)
• 3
  (A), (C) and (D)
• 4
  All (A), (B) (C) and