_____________ is the period during which an embryo develops into a newborn until its birth.

Explanation

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for the term that describes the period during which an embryo develops into a newborn until its birth.

2. **Identifying the Term**: The correct term for this developmental period is "gestation period."

3. **Defining Gestation Period**: The gestation period is the time frame during which the embryo grows and develops inside the mother's womb. In humans, this period typically lasts about 9 to 10 months.

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