How to do this question plz answer

Explain the importance of producers, primary consumers, secondary consumers. and decomposers in an ecosystem

Legumes, a type of plant, require rhizobia, a type of soil bacteria, to survive since these organisms fix nitrogen during photosynthesis. rhizobia use the legumes for food. what would most likely happen to the legume population if rhizobia suddenly became extinct?

15 ! come and answer! a(n) is the general term for an infectious disease that has spread across a city, region, or country.