Question

multiple cholce question
during the early stages of development, the ____ forms, which then produces blood cells for the embryo.
o chorionic villi
o placenta
o yolk sac
o amniotic fluid

Explanation:

• Chorionic villi: Involved in gas and nutrient exchange but not the main early blood - cell producer.
• Placenta: Forms later and is for long - term support, not the initial blood - cell source.
• Yolk sac: In early development, it is the site of blood cell production for the embryo.
• Amniotic fluid: Protects the embryo physically, no role in blood cell production.

Answer:

yolk sac