First, Emma learned about [___].
Then, she learned about the [___] stage.
Next, Emma learned about [___].
Last, she learned about the [___] stage.
During the [___] trimester, the fetus rapidly gains weight.
During the [___] trimester, the fetus’s sex organs develop.
The umbilical cord forms during the [___] trimester.
The lungs do not develop until the [___] trimester.
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