[问答题]
The image shows a food wh3 eej2 x/8j vema wb.wk.p+4yeb qdlg erux 61,7l4i9ony/gqg/ in a salt marsh ecosystem.
1.Identify all the detritivores in the food web shown above.
2.Define secondary productivity.
3.Explain why energy is lost during the transfer from producers to herbivores.
4.Describe a method a farmer could use to estimate the gross primary productivity per month of his wheat crop.
