Fetal movement begins; lungs start developing surfactant.
If you are searching for the you are likely looking for more than just a list of correct answers. You need a conceptual roadmap that explains why a zygote becomes a fetus, why a teenager’s brain is still under construction, and why an elderly person’s bones become brittle. development and aging timeline pltw answer key
The timeline for puberty varies, but the sequence of hormonal events is consistent. Fetal movement begins; lungs start developing surfactant
Puberty triggers systemic changes managed by the endocrine system. Fetal movement begins