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Which significant organ development occurs during the fourth week of pregnancy?

• The digestive system begins to form.

• The lungs start to develop.

• The heart forms and begins to function with its own blood flow.

• The fetus can show reflexes.

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What significant development occurs in the fetus's skin between weeks 20 and 22?

• Hair growth

• Nail formation

• Oil glands begin to function

• Skin pigmentation

What important respiratory development occurs in the fetus between weeks 23 and 26?

• Lungs fully developed

• Fetus starts breathing air

• Fetus begins inhaling and exhaling amniotic fluid

• Diaphragm fully forms

What is the estimated survival rate for fetuses born between weeks 27 and 31?

• 50%

• 75%

• 91%

• 100%

What is the approximate weight range of a fetus between weeks 32 and 36?

• 0.5 - 1 kg

• 1.2 - 1.7 kg

• 1.8 - 2.3 kg

• 2.5 - 3 kg