[问答题]
A student wants to set up
0 er.fld0d78 emuo5tpan
wrc/1uz. k59tdoy:.1kt vmqzaquatic mesocosm using seawater to simulate conditions in the food web (shown in the image below) and
9qzv5cw1u t:zd k.rym/1tk o. test 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.
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.