This figure has rock units and geologic features that are assigned letters that are not in any particular order.From the geologic relations, what is the youngest unit or feature of those listed below? 
Definitions:
Salivary Amylase
Salivary amylase is an enzyme secreted by the salivary glands that begins the digestive process by breaking down starch into simpler sugars.
Starch Digestion
The process by which dietary starch is broken down into simpler sugars, like glucose, by the action of enzymes.
Parotid Glands
The largest salivary glands, located near the ears, that produce saliva to aid in digestion.
Osteoblast Activity
The process involving cells responsible for bone formation and mineralization.
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