Explain how blood type is an example of
both codominance and multiple alleles.

In the hereditary pattern of Mendel's laws, there are two phenotypes, in that of incomplete dominance or three intermediate inheritance, as well as in codominance; in multiple alleles more than three phenotypes are manifested depending on the number of alleles present in the population. A typical example is the alleles of the blood group system. Multiple alleles originate from different mutations in the same gene.

Explanation:

We speak of multiple alleles when there are more than two possible alternative alleles to specify certain traits. According to the hereditary pattern of Mendel's laws, each hereditary characteristic is regulated by two alleles, in contrast to multiple alleles in which a hereditary characteristic is regulated by more than two alleles, for this reason they can only be studied in populations in where the number of individuals allows the manifestation of these characteristics, such as blood groups in the human population, which are classified according to the presence of certain chemicals that red blood cells have, called antigens. Type A blood has an antigen called A, type B blood has an antigen called B, type AB blood has the A antigen and B antigen, and type O blood has no antigen. These blood types are determined by a gene that has multiple A, B, and O alleles. The A and B alleles are codominant, while the O allele is recessive. For this reason, a person with blood type A has either two AA alleles, or one A and one O allele.

you are certainly talking about this picture:

a: is the label of the white square, it is showing the  replication fork, formed by helicase (d) ==> so it is the site of dna separation and replication 

b: is a new dna brand that is following directly the replication fork, so it is continuous ==> built continuously from 5' to 3

c: dna polymerase cannot replicate dna on its own, it needs the of their proteins, and one of them plays the role of a clamp which fixes  the dna with the dna template and increases  the processivity of the enzyme. ==>   stops polymerase from falling off the  template.

d: is the enzyme responsible for forming the replication fork (helicase) ==> unwinds and separates dna into two strands

e: is the delayed strand, it is built  in the opposite sense of the helicase, so dna will be built in fragments ==> built  fragments from 5' to 3 joins

and finally f: is the enzyme that builds  the new dna strand (dna polymerase) ==>   adds nucleotides to make a new dna helix.

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one characteristic that is shared by all is a soft body. many

of these invertebrate animals also have an outer shell to protect their

body. oysters, clams, snails, and mussels are all mollusks. so are octopuses, squids, and slugs. mollusks live on land and in freshwater.