B because the periodic table tells you the groups of the elements
If you have type A blood then you must have at least one copy of the A allele. However, you could also have two copies of the A allele within type A blood. The genotype, therefore, would be either AO (if they have 1 A allele) or AA (if they have 2 A alleles).
Its a large ductless gland in the neck that secretes hormones regulating growth and development through the rate of metabolism.
