Where would a primary producer be located in a food chain

Sydney drew a flow chart to illustrate the nitrogen cycle.which labels best complete the flow chart? x: producers undergo photosynthesis.y: nitrogen compounds are released into the air.x: nitrogen compounds are released into the air.y: producers undergo photosynthesis.x: free nitrogen is in the atmosphere.y: producers absorb nitrogen compounds through their roots.x: producers absorb nitrogen compounds through their roots.y: free nitrogen is in the atmosphere.

How do you date a sample of rock that you suspect as being one of the earliest on earth

2. given that most biochemical (other than coal) rocks react with hydrochloric acid, what does that tell you about organisms?