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If you put an egg in a cup of vinegar for three days, the outside shell will dissolve but the membrane does not. That means that the egg will hold it's shape and be opaque or see through. Students will be able to see what an egg looks like before you crack it open.
Did you ever wonder what chick eggs do at night?
This is how our chick eggs will look through the process of development.
The full process takes about 21 days.