Harry was a preterm newborn who was born after 26 weeks of prenatal development. He is now a healthy, happy 2-year-old. Harry's ability to survive after being born so early was due in part to his reaching the _____.

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Question restatement: Harry was a preterm newborn born after 26 weeks of prenatal development and is now a healthy 2-year-old. His survival after being born so early was due in part to reaching the _____.
Option 1: age of viability. This is the correct concept: the age of viability refers to the gestational age at which a fetus has a reasonable chance of surviving outside the uterus with or without medical help, typically around 24 weeks or later. Since Harry reached a gestational age where survival is possible, this aligns with the idea that his early birth was survivable because he had reached viability.
Option 2: neurogenesis point. Neurogenesis is the process of generating new neurons, which occurs during development but is not a defined threshold for survival after preterm birth. The term does not mark a practical milestone for outside-the-womb survival, so this option is not correct.
Option 3: term of postnatal development. This phrase is not a standard developmental milestone; it does not specify a gestational age or biological threshold relevant to premature survival. Therefore, it does not fit the concept described in the question.
Option 4: germinal period. The germinal period refers to conception through the first two weeks of development, a very early stage before organ formation. This option is clearly unrelated to the question about survival after birth and is not correct.
In summary, the key idea is identifying the threshold gestational age at which a preterm infant has a meaningful chance of surviving outside the womb, which is the age of viability, while the other options do not correspond to that critical milestone.

Harry was a preterm newborn who was born after 26 weeks of prenatal development. He is now a healthy, happy 2-year-old. Harry's ability to survive after being born so early was due in part to his reaching the _____.Single choice

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