What is the correct code for a Barrett's ulcer with bleeding?

All of the following are necessary for a clot to form except:

a. Platelets b. Coagulation protein c. Plasmin d. Endothelial cells

Microorganisms are classified by taxonomy in order to

A) differentiate them based on phenotypic characteristics. B) allow scientists to share information on them in a universal language. C) categorize them based on their mode of reproduction. D) categorize them as animal or plant.