All of the following statements are true of allergens EXCEPT ________

A) synthetic chemicals may trigger allergic reactions
B) people with allergies have weakened immune systems
C) asthma can be triggered by allergies
D) everyone is affected by an allergen at a high enough dose
E) allergens trigger an immune response when one is not necessary


Ans: D) everyone is affected by an allergen at a high enough dose

Environmental & Atmospheric Sciences

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Fertilizer use is least common in

A) Africa. B) the United States. C) Europe. D) Asia.

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The time in Earth’s history before 4 billion years (4000 m.y.) is known as the ____

a. Hadean b. Proterozoic c. Archean d. Paleoarchean e. Eoarchean

Environmental & Atmospheric Sciences

What is the largest country (in terms of land area as well as population) in the Australia and Oceania region?

A) Australia B) Fiji C) New Zealand D) Solomon Islands E) Vanuatu

Environmental & Atmospheric Sciences

Which of the following is true of carbonate salts and phosphate salts?

A) Most carbonate salts are soluble but most phosphate salts are insoluble. B) Most phosphate salts are soluble but most carbonate salts are insoluble. C) Most carbonate salts and most phosphate salts are soluble. D) Most carbonate salts and most phosphate salts are insoluble.

Environmental & Atmospheric Sciences