Have you ever wondered how the embryo in an egg gets oxygen? Where the colour of multi-coloured bird eggs come from, and how on earth an eggshell can be strong enough to protect the embryo, but not so strong that a weak little hatchling cannot break it open? In this article we unscramble the mysteries of the egg – creation’s perfect self-contained life-support system.
Quick facts
• The uid in the shell protects the embryo against excessive heat and cold, and against hard bumps.
• The embryo has its own source of food è the egg yolk is the main source
