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Ave Challenge: who invented the egg?

This question is multiple choice.  The question is really about the all season egg .. how did it happen that we got to be able to buy eggs 12 months a year?

Which invention made this possible?   (links bring you answers in audio).

a. the phonograph

b. the refrigerator

c. plant based estrogens .

d. steam heat

e. the electric light bulb.

 


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