FILL UP allers 1. The substances that cause allergic reactions are called 2. Dust mites feed on of humans and animals. 3. Sun allergy is also known as allery 4. Swelling of lips, tongue and throat are symptoms of 5. Allergy that occurs only at a certain time of a year is called 6. Allergy that occurs year round and not only in at a particular time of the years called allergy. 7. is generally done to see whether a particular substance caus allergic skin irritation.
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Allergies are your body's reaction to a substance it views as a harmful “invader.” For example, coming into contact with what is normally a harmless substance, such as pollen, might cause your immune system (your body's defense system) to react. Substances that cause these reactions are called allergens
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