What is the best description of the term "environment?"

The correct answer is "Effect." Effect means to produce or bring about a result or outcome. It is often used in the context of causing something to happen or achieving a specific goal.

The correct meaning of "aegis" in the sentence is "Responsibility." When someone says that something is "under the aegis of something," it means that it is with the protection or support of someone or something, especially an organization. As such, responsibility best fits the description. In this case, the public health department has the responsibility or oversight for providing immunizations to the indigent population, indicating its protective or supportive role in ensuring public health.

The word "bilateral" in the sentence means "Two-sided." Bilateral weakness indicates weakness affecting both sides of the body or both limbs, as opposed to unilateral weakness, which would affect only one side.

The correct word to use in the blank is "breathe." Breathe is a verb we use for the process of inhaling and exhaling, while breath is a noun that refers to a full cycle of breathing. In this case, breathe is more appropriate because a child with a stuffy nose might find it hard to breathe, indicating difficulty in inhaling and exhaling air through the nasal passages.