Yolk

Difference between gestational sac and yolk sac?
The gestational sac looks like a white rim around a clear center. ... The yolk sac isn't visible until around 5.5 to 6 weeks gestation when using an a...
Difference Between Egg white and Yolk
The yolk is the yellow part of the egg, and gets its color from plant pigments in the hen's food. ... Egg yolks are made primarily of fats, proteins, ...