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The continents, riding on tectonic plates, have crashed together and separated several times during the earth's history.
Culture Dish
A shallow, flat-bottomed container used in laboratories for growing organisms such as bacteria or cultured cells.
Embryo
An early developmental stage in many multicellular organisms, in humans it refers to the stage of prenatal development from fertilization until the end of the eighth week.
Nuclear Families
A family unit consisting of two parents and their children living together as a single household.
Traditional Nuclear Families
A family unit consisting of two parents and their children living together, representing a conventional family structure.
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