They can both be used to identify organisms. Also, the phenotype of an organism is different depending on the genotype of the organism, making them relate to one another.
Hope this helps. Good luck! :)
Blue (right) is deoxygenated and Red (left) is oxygenated.
think of it as like a cartoon when a character cant breathe, they turn purple or blue. While in real life, deoxygenated blood is not actually blue and it is a deep red and the oxygenated blood is bright red. They just show it as blue to help you differentiate.
Stores lining cuts off unused time