[填空题]
A student wants to set up an aqupqd)hmlejzb( a- q4. )atic mesocosm using seawater tp2 ejy ym/2a4vk)rq*0d, psdro simulate conditions in the food web (shown in the image below) and testv*s)pakdry 4j/q2 ey0,d2r mp its stability. He used seawater and sand from the area to set up the system and added some small organisms to the mesocosm.
1.In the food web shown, identify an autotroph ,which is .
2.State a reason why phytoplankton shown in the food web would be a good addition to the mesocosm.
3.Discuss how saprotrophs perform a necessary function for the mesocosm.
4.Describe the disadvantages of using mesocosms in scientific investigations.
