[填空题]
A student wants to set up an aquatic mesocosm usingou.xbs 9)f: z; fj+xkk seawater to simulat1tp2);zh jrlksuu+ r inmx36 j4 .wnr+e conditions in the food web (shown in the image below) and test its stabilitymp 4 ur6+hnzr ; i1rns)tx3 j.2ljuk+w. 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.
It 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.
