What type of organism is always found on the first step

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?

Is a measure of the different types of organisms in a community. question options: tertiary secondary primary none of the above

What processes would you expect to be key in the production of yogurt ?