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What does the amniotic sac do
Protects baby from any bumps and regulates temp
What travels from mothers blood to fetus
Oxygen, glucose, hormones, calcium, iron, water, virus etc
What travels from fetus to mother
Urea, CO2
Adaptations of exchange surfaces (placenta, lungs, smal intestine etc)
Large surface area, short diffusion pathway
What is fertilisation
Where 2 gametes fuze