The letter D in the image below of the paranasal sinuses labels the _____ sinuses. 
Definitions:
Single-Parent Homes
Households headed by a single individual who is responsible for raising children.
School Achievement
The level of academic performance and success achieved by an individual within an educational environment.
Family Income
The total amount of money earned by members of a family, contributing to their household.
Gay Parents
Refers to homosexual individuals or couples who are raising children in a family setting.
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