Larry moved from chicago to atlanta. for the first two years he lived there he had no allergies in the spring. then, in the third year, he had very bad allergic reactions to spring pollens. what is the most likely explanation for this delayed effect? a) he spent more time outside during his third spring in atlanta. b) the effects of the immunity he had from chicago gradually wore off. c) his body had built up enough antibodies to cause the allergy symptoms. d) the pollen levels in atlanta were growing steadily during the three-year period.
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Ответ:
C) His body had built up enough antibodies to cause the allergy symptoms.
His body had built up enough antibodies to cause the allergy symptoms. Often the first few exposures to an allergen will not bring about the reaction, for this reason.
Ответ:
When Pangaea broke up, the northern continents of North America and Eurasia became separated from the southern continents of Antarctica, India, South America, Australia and Africa. The large northern continent is called Laurasia and the southern continent is called Gondwanaland.