Which process in the nitrogen cycle turns nitrogen into ammonium?

How many trophic levels are there in the following food chain? phytoplankton - shrimp - perch - pike - osprey

Name the two stages involved in protein synthesis and explain what occurs in each of the two stages. be sure to also indicate where each process takes place. plz don't give one sentence answers : d

Aplant may open end close its stomata to prevent excess water loss and maintain