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Dull gray colors are characterized by ________.

An A horizon with a sharp, distinct boundary at about 6 inches due cultivation would most likely have which subordinate distinction

A soil with a Bx horizon is likely to have a ________ indicating a potential perched water table

In industrial societies, being old has typically been seen as __________.

One of several hydric soil indicators is:

The atrioventricular node starts each heart beat and is often called the pacemaker of the heart for that reason.

The ________ receives blood from the superior vena cava and the inferior vena cava.

The regulation of blood flow by local mechanisms within a capillary bed is called

The right atrium receives blood from the

The ________ is the difference between the resting and maximal cardiac output.