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MU Biology Osmolarity of Environment Questions

Overview

I'm working on a biology question and need an explanation and answer to help me learn.

figure from photo.1.

1.Describe the relationship between the osmolarity of the aquatic environment and the extracellular fluid of organism A.

2. Multiple choice:Using the information in the graph from the question above identify whether organism A is an osmoconformer or osmoregulator.(Osmoregulator or osmoconformer). 

3.Describe two mechanisms (ways) that a fish living in freshwater regulates the salt balance of its extracellular fluid.

Second photo 

1.Which of the four main functions of the nephron predominately occurs at the structure labelled A? 

2.Identify the structure in the figure above and describe the process you answered in the previous question.