6. What part of the egg serves as the food of the developing bird? A. albumen B. shell D. yolk D. None of these 7. How many days does an egg of a chicken develop into a new organism? A. 7 B. 14 c. 21 D. 28 8. What helps to maintain the egg yolk in its position and prevent it to scramble? A. thick albumen B. shell C. egg white D. None of these 9. What do you call the hollow ball of cells in which fertilized egg develops? A. blastocyst b. embryo C. womb D. All of these velop in the mother's womb an
