It is called 'Competition'. The organisms are 'competing' to live, so the answer is competition.
DNA is a structure that can be compared to A) Blueprints. This is because of DNA's role in the cell. DNA tells ribosomes how to make proteins just like a blueprint tells workers how to build a building.
In the nephron, your blood is filtered by the tiny blood vessels of the glomeruli and then flows out of your kidney through the renal vein.
