How would you recognise red blood cells when looking at a colour photograph of blood taken with a light microscope?

Erythrocytes, or red blood cells, are by far the predominant cell type in the blood smear. They appear as biconcave discs of uniform shape and size (7.2 microns) that lack organelles and granules. Red blood cells have a characteristic pink appearance due to their high content of haemoglobin.

answer; i believe the answer is (polygenic inheritance;

because they are eaten by the frog and the frog getseaten by the snake and the snake by the eagle