本题目来源于试卷: Form and Function B.10 Ecological Niches，类别为 IB生物学
[单选题]
A student set up an a,+x luodlf:r. qu9rle1u lzx26s nm( :quatic mesocosm using a commercially available seawater-filled glass orb, which included qu(2xl zr:s 1 mue6l9nalgae, shrimp, some corals and gravel. The student placed it near a window to provide a light source. Which of the following statements are true?
I. The algae are autotrophs, produce carbon compounds and provide oxygen for organisms in the mesocosm
II. Saprotrophs present in the water and gravel help to recycle nutrients found in dead organisms
III. Herbivores usually present in a natural ecosystem can be excluded in the mesocosm
A. I only
B. I and II only
C. II and III only
D. I, II and III
参考答案: D
本题详细解析:
| 
