What is the genotype of a person with type O blood?

If an individual has the A blood type, how many different genotypes can they possess?

This vessel takes blood away from the kidney:

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This buffer system acts w/in the urinary tract:

Renal cortex:

Pressure pushes material out of the renal blood as it moves through the glomerulus:

Inspiration is accomplished when the diaphragm and external intercostal muscles contract.

What is the phase of urine creation that moves substances out of the blood capillaries that were missed in the initial filtration process: