How can scientists maximize the production and efficiency of microalgae?

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.

The organelle pictured is found in cells of and is theorized to have once been an independent organism.

Identify the various levels of atmosphere. troposphere mesosphere exosphere stratosphere thermosphere