Oxygen rich blood is carried in blood vessels is called?

When organisms are classified ,they are given a two part name

Which of these organisms have the greatest amount of cell specialized

Agene pool: a) is the collection of all the alleles found in a single species b) is the collection of all the alleles found in a single population c) is the collection of all the chromosomes found in a single population d) is the collection of genes in a species that allow the individuals to swim