Cells, tissues, organ, and body system.
Salt concentration is the factor among the following factors given in the question that does not vary between a fast flowing river and a pond that receives no water input. The correct option among all the options that are given in the question is the second option. I hope the answer comes to your help.
Answer: d. assimilating the nitrogen into their own biomolecules.
Explanation: I just had this question for an assignment.
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The cell’s nucleus contains chromosomeschromosomes: Rod shaped bodies found in the nucleus of cells that contain genetic information (DNA). made from long DNA molecules. The diagram shows the relationship between the cell, its nucleus, chromosomes in the nucleus, and genes.
Prokaryotes do not have membrane bound organelles, but eukaryotes do.