Answer:A. route of exposure
Explanation:Route of exposure refers to how someone got exposed to that allergen that got them sick. There are different routes of exposure , the way in which a substance enter one's body , it can be through inhalation, ingestion , skin absorption and injection. For example inhalation occurs mostly when a substance is a chemical in the form of vapours , gases , particulates and mist .
For this reason by knowing how it entered the body the pediatrician can determine what the substance might have been.
A prospective study recruits and follows healthy subjects for a long period of time to determine the factors that contribute to the development of disease.
A prospective Study look at, on occasion, referred to as a potential cohort study, is a type of longitudinal take look at where researchers will observe and look at a collection of topics over a time frame to acquire information and file the development of outcomes.
A prospective observation is a longitudinal cohort examination that follows over time a set of comparable folks that differ with admire to certain elements underneath take a look at, it to decide how those elements affect fees of positive final results.
A prospective look is one that identifies a scientific commonly medical hassle to be studied and specifies an examination design protocol e.g. what you're measuring, who you're measuring, how many subjects, and many others. and then gathers records within the destiny according to the layout.
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Answer:
Two months prior to Gettysburg, Lee had dealt a stunning defeat to the Army of the Potomac at Chancellorsville, Virginia. He then made plans for a Northern invasion in order to relieve pressure on war-weary Virginia and to seize the initiative from the Yankees. His army, numbering about 80,000, began moving on June 3.
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