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_____ Are to _____ as Fingerprints and DNA Are to Detectives

question 4

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_____ are to _____ as fingerprints and DNA are to detectives.


Definitions:

Exchange

The process of trading or swapping substances or values, which in a biological context often refers to the transfer of gases or nutrients between cells and their environment.

Endothelium

Layer of flat cells lining blood and lymphatic vessels and the chambers of the heart.

Precapillary Sphincters

Circular muscular valves located at the entrance of capillaries, regulating blood flow into the capillary beds according to the body's needs.

Tunica Media

Middle, usually muscular, coat of an artery or another tubular structure.

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