Chen drew a diagram to compare the ways in which different organisms obtain nitrogen. which label belongs in the area marked z?

When a septic tank backs up a goes in to clean it out

Maya wrote if you step to describe how carbon circulates between the atmosphere and living organisms

In what way do investigations build scientific knowledge? the results of investigations lead to questions that cannot be tested. they reflect the opinions and social values of scientists, ensuring valid information. the results of investigations lead to new questions, which lead to new investigations. they are not influenced by the research of earlier scientists, so they are able to address gaps in understanding.i