(a) Chorion
(b) i) Umbilical arteries, umbilical veins/ capillaries
(ii) More food nutrients; more oxygen in veins; less food nutrients; more excretory products in arteries
(c) - Highly vascularized; large surface area
- Presence of secretory cells
d) Cushion or acts as a shock absorber of the foetus
johnmulu answered the question on May 12, 2017 at 06:32
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