Based on the evolutionary tree, which letter represents the common ancestor of all eukaryotes?
Definitions:
Vena Cava
A large vein carrying deoxygenated blood into the heart, consisting of two main branches, the superior and inferior vena cava.
Arteriole Branch
A small branch of an artery leading into capillaries, responsible for regulating blood flow from arteries to capillaries.
Infarction
The blockage of blood flow to a specific organ or area of tissue, leading to the local demise of that tissue.
Severe Headache
A type of pain in the head that is intense and often debilitating.
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