Four bones of the skull contain paired air spaces called the paranasal sinuses that help to lighten the heavy load of the head.
<h3>What is Paranasal Sinus?</h3>
The paranasal sinuses are air-filled, bony spaces located next to the nasal passages in the face bones of the skull. They grow via slowly expanding pneumatized cells that erupt from the nasal cavity. The term is typically used in everyday speech to refer to the hollow, air-filled spaces in front of the human skull. There are four pairs of sinuses in humans. There are now eight sinuses in all. These four pairs of sinuses are together referred to as paranasal sinuses since they are all joined to the nasal cavity.
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Answer:
i think its a.b.c.d.e.f.g.h.i.j
Explanation:
because they all have to be in one sentence.
Answer:
the answer is fiber, because you can't eat fiber.
Answer:
A retrospective cohort study
Explanation:
A retrospective cohort study is a type of observational epidemiologic study where the risk of disease is retrospectively (i.e., posteriorly) compared between an exposed group versus a non-exposed group. In a similar way to prospective cohort studies, a retrospective cohort study also categorizes individuals under study depending on if they were exposed or not to the factor of interest. However, in this type of experimental design, the study begins at a point in time after both exposure and outcome have already occurred. Thus, a retrospective study is conceived after some individuals have already developed the outcome (e.g., disease/disorder) of interest.
